Narrow-bandgap Sn-Pb mixed perovskite single crystals for high-performance near-infrared photodetectors.

Narrow-bandgap Sn-Pb mixed perovskite single crystals are highly promising as photoactive materials for efficient and low-cost near-infrared (NIR) photodetectors. However, because of the significant difference in the crystallization velocities for Pb- and Sn-based perovskites, Sn-Pb mixed perovskites are peculiarly prone to phase separation during the crystallization process, causing the degradation of the optical and electronic properties of materials. Herein, we propose a low-temperature space-confined technique (LT-SCT) that simultaneously reduces the crystallization velocities of pure Sn and Pb perovskites, enabling the fabrication of pure-phase (FASnI3)0.1(MAPbI3)0.9 single crystals. The resulting (FASnI3)0.1(MAPbI3)0.9 single crystals exhibit excellent crystallinity with a high hole mobility of 7.44 × 103 cm2 V-1 s-1 and a low surface trap density of 1.88 × 109 cm-2. These properties benefit the application of (FASnI3)0.1(MAPbI3)0.9 single crystals in self-powered NIR photodetectors and yield outstanding comprehensive performance, especially with a broad linear dynamic range of up to 163.5 dB, a large responsivity (R) of 0.53 A W-1, and a fast response speed of 22.78 µs in the NIR spectral region (750-860 nm). Furthermore, high-quality NIR imaging and wearable health monitoring are achieved by employing high-performance and self-driven NIR photodetectors. This work contributes to developing Sn-Pb mixed perovskite single crystals and provides a promising candidate for efficient and low-cost NIR photodetection.

[Familial aggregation of metabolic syndrome in adolescents with paternal metabolic syndrome].

OBJECTIVE: To analyze the impact of parental Metabolic Syndrome (MS) on adolescents, and to explore the familial aggregation of MS with its components. METHODS: Using a 1:3 case-control familial study design to choose 26 MS male patients as proband and 78 healthy men as controls. Data regarding phenotype of their adolescence offspring were collected. Height, weight, waist circumference (WC), blood pressure, body mass index (BMI), waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR) were measured or calculated. FPG, TC, TG, HDL-C and LDL-C were detected by automatic biochemical analyzer and hs-CRP was detected. RESULTS: WC, WHtR, WHR, DBP and hs-CRP of those adolescents with paternal MS were significantly higher than in controls (P < 0.05). Rates of MS, Obesity depend WC, low level of HDL-C of adolescent with paternal MS were significantly higher than in controls (P < 0.05). The rate of number on MS was significantly higher in case group than in control (r = 0.231, P < 0.05). CONCLUSION: The phenotypes of MS were different between adolescents with or without parental MS, indicating that the familial aggregation of MS had been existed in their adolescent offspring, and mainly presented in central obesity, increased blood pressure and inflammation.

[Risk factors for emotional abuse in 844 adolescents].

OBJECTIVE: Emotional abuse and neglect is an under-recognized, but is a common form of child abuse. This study aimed to investigate the risk factors for emotional abuse in adolescents. METHODS: A cross-sectional survey on emotional abuse was conducted by anonymous self-administered questionnaire in 865 adolescents randomly sampled from three junior schools in Harbin City. A total of 844 valid questionnaires were received. Risk factors were studied by multivariate non-conditional regression analysis. RESULTS: Over the past year, 47.3% of the 844 respondents suffered from emotional abuse. Monovariate regression analysis indicated that emotional abuse was related to 19 factors, including children's health status, parental marital status, parental educational levels, family rearing patterns, family atmosphere and so on. Multivariate regression analysis showed poor children's health status (OR=1.877, P=0.001), bad parental marital status (OR=1.768, P=0.004), and unjustifiable family rearing patterns [over-interference (OR=3.004, P=0.006) and assentation (OR=5.430, P=0.032)] were risk factors for the occurrence of emotional abuse. The harmonious family atmosphere and the harmonious relations between children and their parents were protective factors for emotional abuse. CONCLUSIONS: The prevalence of emotional abuse is high in adolescents. Poor children's health status, bad parental marital status and unjustifiable family rearing patterns are risk factors for the occurrence of emotional abuse.