Novel Bilayer SnO2 Electron Transport Layers with Atomic Layer Deposition for High-Performance α-FAPbI3 Perovskite Solar Cells.

Perovskite solar cells (PSCs) based on the SnO2 electron transport layer (ETL) have achieved remarkable photovoltaic efficiency. However, the commercial SnO2 ETLs show various shortcomings. The SnO2 precursor is prone to agglomeration, resulting in poor morphology with numerous interface defects. Additionally, the open circuit voltage (Voc ) would be constrained by the energy level mismatch between the SnO2 and the perovskite. And, few studies designed SnO2 -based ETLs to promote crystal growth of PbI2 , a crucial prerequisite for obtaining high-quality perovskite films via the two-step method. Herein, we proposed a novel bilayer SnO2 structure that combined the atomic layer deposition (ALD) and sol-gel solution to well address the aforementioned issues. Due to the unique conformal effect of ALD-SnO2 , it can effectively modulate the roughness of FTO substrate, enhance the quality of ETL, and induce the growth of PbI2 crystal phase to develop the crystallinity of perovskite layer. Furthermore, a created built-in field of the bilayer SnO2 can help to overcome the electron accumulation at the ETL/perovskite interface, leading to a higher Voc and fill factor. Consequently, the efficiency of PSCs with ionic liquid solvent increases from 22.09% to 23.86%, maintaining 85% initial efficiency in a 20% humidity N2 environment for 1300 h.

Resource allocation, individual social network, community trust and recovery from depression among rural survivors in the Wenchuan Earthquake.

Using the three-wave longitudinal survey data of the Wenchuan disaster area, this study employed Hierarchical Linear Modeling (HLM) to explore the recovery trajectory from depression of rural survivors after the Wenchuan earthquake. Across the three waves, 221 respondents (118 male, 103 female) provided complete data. We found that, at the individual level, the survivors' individual social networks had a significant effect on the change in depression scores in the four years following the earthquake, implying that a strong social network could help survivors recover from depression. At the community level, community trust had a significant effect both on the initial depression score at the time of the earthquake and on the survivors' change in depression scores after the earthquake. Survivors with high community trust had significantly lower depression scores, compared with those with low community trust at the time of the earthquake; however, the depression scores of the former increased in the four years following the earthquake and gradually approached the average depression level. At the social level, relief resource allocation also had a significant effect on the change in survivors' post-disaster depression; those who deemed the resource allocation to be very fair had a decrease in depression scores. The results of our study show that rich individual social networks and allocation of relief resources contribute to earthquake survivors' recovery from depression. Therefore, besides providing more adequate relief resources to survivors, we should also emphasize the rebuilding of their social networks.

Social capital, policy fairness, and subjective life satisfaction of earthquake survivors in Wenchuan, China: a longitudinal study based on post-earthquake survey data.

BACKGROUND: Existing research has rarely examined an earthquake's sustained impact and the trajectory of the earthquake survivors' life satisfaction over time. This study aims to analyze longitudinal changes in life satisfaction of Wenchuan earthquake survivors and the impact of social capital and government relief policy. METHODS: This research applied a hierarchical linear model to longitudinal survey data collected after the earthquake. The survey was divided into three waves and was collected from Deyang City and Mianyang City of Sichuan Province. A random sampling method was used; a sample of 225 participants had valid responses over three waves of the survey. RESULTS: This study found that a survivor's social capital and the perception of the fairness of government relief policy have a significant effect on the trajectory of life satisfaction post-disaster. First, the initial life satisfaction of those with high social capital was significantly higher than of those with low social capital, whilst survivors with high social capital had a lower rate of change in life satisfaction. Second, one year after the earthquake, those who felt government policy was unfair had a lower life satisfaction than those who felt it was fair. However, from the first year to the fourth year after the disaster, survivors who believed that the government policy was unfair experienced a higher rate of change in life satisfaction than those who did not. Third, the fairness of government relief policy moderates the relationship between survivors' social capital and changes in life satisfaction. A fair policy of relief can reduce the negative impact of the lack of individual social capital on life satisfaction. CONCLUSIONS: Survivors reconstruct life satisfaction through their social network and the perception of the fairness of the government's post-disaster relief policy. Therefore, to promote the improvement of life satisfaction of survivors, it is necessary to cultivate social capital and ensure fairness of the relief policy.

Reduction but not elimination: health inequalities among urban, migrant, and rural children in China-the moderating effect of the fathers' education level.

BACKGROUND: Given the urban-rural structure and the increase in rural-to-urban migration, three types of children have emerged in contemporary China: rural, urban, and migrant children. Health disparities among these types of children have caused widespread concern, being the main contributor to health inequalities among children in China. The purpose of this study was to investigate health disparities among these children and the mechanisms underlining them. METHODS: This research applied multiple linear regression to data obtained from the Chinese Education Panel Survey (CEPS), a national representative survey of 7772 students from 2014 to 2015. Multiple linear regression with interactive terms was used to explore how gender and father's education moderate the degree of health inequalities among the children. 'Height for age Z-scores' (HAZ) was deployed as the indicator of the children's health status, with larger scores indicating better health status. RESULTS: The findings of the current study were threefold: First, this study found significant health disparities among the three types of children. Urban children are generally the healthiest (M = 1.064), followed by migrant children, (M = 0.779) and rural children (M = 0.612). Second, fathers' education significantly compensates for the heath disparities among the children. Fathers' education has a larger effect in compensating a rural-migrant difference (b = - 0.018, P < 0.05) than a rural-urban difference (b = - 0.016, P < 0.1). Third, the compensating effect of the fathers' education varies by gender. The compensating effect is larger for boys (b = 0.028, P < 0.001) than for girls (b = 0.025, P < 0.01). CONCLUSIONS: This study found significant health inequalities among urban, migrant, and rural children, which might be shaped by the distinction of urban-rural structure and the process of rural-to-urban migration in contemporary China. Fathers' education also plays an important role in narrowing-but not eliminating-the health inequality between urban and rural children. Furthermore, the compensating effect of fathers' education is higher for boys than for girls, reflecting the patriarchal tradition in China. The currents study suggests that to promote the healthy growth of children, it is necessary to consider the health inequalities among different types of children when developing health-related policies. Factors like family socioeconomic status and gender may likewise play an important role in the implementation of policies.

How Does Physical Exercise Improve the Subjective Well-Being of the Chinese Adult Population? A Moderated Mediation Model.

Based on the 2017 data from the China General Social Survey (CGSS), the conditional process analysis method was used to explore the relationship between physical exercise and subjective well-being, as well as the mediating effect of social capital and the moderating effect of Internet use. This study found that the effect of physical exercise on subjective well-being includes both direct effects and indirect effects. Physical exercise directly and positively affects SWB and partially affects SWB through social networks as a mediating variable. Additionally, Internet use can moderate the direct effect of physical exercise on SWB and the mediating effect of social networks on the relationship between the two. As the frequency of Internet use increases, the link between physical exercise and social capital weakens, resulting in a decreased promotion effect on SWB. The results of this study further reveal the internal mechanism linking physical exercise and the improvement of SWB, which is of great significance for enhancing the accessibility of physical exercise facilities and promoting a healthy online lifestyle, ultimately leading to improved well-being among residents.

Stabilization of Component-Pure α-FAPbI3 via Volatile Additives for Stable Photovoltaics.

State-of-the-art high-performance perovskite solar cells are mainly based on formamidinium (FA)-dominated perovskites because of their narrow band gap and remarkable thermal resistance. However, photoactive α-FAPbI3 is prone to transit to the photoinactive phase, and pioneering phase stabilization strategies can induce undesirable band gap broadening or phase segregation, seriously restricting the efficiency and long-term stability of the resultant photovoltaics. Herein, a small molecule of ammonium acetate (NH4Ac) was introduced as an additive in a modified ripening method to fabricate component-pure α-FAPbI3. Owing to the strong interaction between NH4Ac and PbI2, FAI via Pb-O coordination, and N-H···N hydrogen bonding, vertically oriented perovskites with relaxed crystal strain were first generated, which were fully converted to α-FAPbI3 in a further ripening process. The NH4Ac was fully volatized after the perovskite formation, resulting in component-pure α-FAPbI3 with a band gap of 1.48 eV and remarkable stability under light illumination. Ultimately, a champion device efficiency of above 21% was obtained based on the component-pure α-FAPbI3 and over 95% of the initial efficiency can be maintained after 1000 h of aging.

The Relationship between Adverse Family Experiences during Childhood and Self-rated Health Outcome in Adulthood.

Although there is increasing evidence of a link between adverse family experiences (AFEs) and long-term health outcomes, few studies have investigated the role of educational attainment in the relationship between AFEs and adult health. The data of this study comes from the China Health and Retirement Longitudinal Study (CHARLS). Here, 15,359 samples were analyzed. Ordered logistic regression with interaction terms was used to explore the moderating effect of education on the relationship between AFEs in childhood and adult self-rated health. The self-rated health scores of people with childhood AFEs were significantly lower than of those without them, particularly in the categories of "parents divorced," "parent died," "physical abuse," "domestic conflict," "parental bias," "physical and emotional neglect," "parental physical illness," 'parental mental illness," "family economic hardship," "experience of starvation," "lived in an insecure neighborhood," and "lived in an unhygienic community." Increases in education level reduced the adverse effects of parental bias and neglect in childhood, but this did not eliminate the negative effect of community's environment on adult health. This study highlighted the role of the level of education in eliminating health disparities, which can reduce the adverse effects of AFEs on health in adulthood.

Physical Exercise, Social Capital, Hope, and Subjective Well-Being in China: A Parallel Mediation Analysis.

Based on data from the 2017 China General Social Survey, a conditional process analysis was conducted to explore the association between physical exercise and subjective well-being, as well as the parallel mediating effect of social networks and a sense of hope. The results showed that physical exercise had a significant positive predictive effect on the participants' subjective well-being. Furthermore, social networks and a sense of hope mediated the association between physical exercise and subjective well-being. Physical exercise indirectly promoted subjective well-being by enhancing social networks and a sense of hope. However, the indirect effect of a sense of hope on the association between physical exercise and subjective well-being was greater than that of social networks. The results of this study revealed the internal mechanism of the effect of participation in physical exercise on the improvement of subjective well-being, which is of great significance for formulating relevant policies and plans to further improve Chinese residents' well-being.

The Moderating Effect of Contact with Children on the Relationship between Adverse Childhood Experiences and Depression in Adulthood among a Chinese Adult Population.

The effect of adverse childhood experiences (ACEs) on depression in adulthood has been identified in many studies; however, the underlying mechanisms remain unclear. To understand the moderating effect of ACEs on depression, a moderation analysis using the interaction effect model was performed based on data obtained from the China Health and Retirement Longitudinal Study. This study found that people with ACEs had significantly lower depression scores than those without ACEs, particularly in categories such as physical abuse, emotional neglect, sibling death, parental illness/disability, parental depression, hunger, violence, and bullying. In addition, the results indicated that contact with children moderated the relationship between ACEs and depression in adulthood. Increased levels of contact with children reduced the adverse effects of parental drug abuse and the experience of starvation, but not physical abuse. This study highlights the role of family support in eliminating health disparities, which can reduce the effects of ACEs on depression in adulthood.

Effect of family-related adverse childhood experiences on self-rated health in childhood and adulthood--childhood friendships as moderator.

Although many existing studies have shown that family-related adverse childhood experiences (ACEs) have a negative effect on individual health, few studies have examined the role of childhood friendships in the relationship between ACEs and health outcomes. The present study used ordered logistic regression analyze the data from the China Health and Retirement Longitudinal Study (CHARLS) conducted in 2014, which is a national representative survey, to investigate the impact of family-related ACEs on self-rated health in childhood and adulthood and the moderating effects of childhood friendships. We found that respondents whose ACEs included physical and emotional neglect, parental physical illness, parental mental illness, family economic hardship, experience of starvation, lived in insecure neighborhood, and lived in unclean community, had a lower self-rated health in childhood and adulthood than those without ACEs. Peer relationship moderates the impact of family-related ACEs-namely, family economic hardship and parental physical illness-on health outcomes, and the increase of peer relationship can reduce adverse effects. Our findings suggest that family-related ACEs are not only related to health in the early life, but also to health outcomes in adulthood. Childhood friendships can reduce the adverse effects of ACEs on health outcomes throughout an individual's life course. Therefore, it is necessary to actively cultivate children's peer relationship networks and improve the quality of childhood friendship.