RESUMO
In this study, molecular doping with polymer dots was designed to unravel its effect on the photoconductivity in organic solar cells. The photocurrent in organic solar cells exhibited a considerable increase under optimal doping concentration, leading to an ultimate enhancement of power conversion efficiency from 2.30% to 3.64%. This can be attributed primarily to the improvement of the initial boost in charge carriers due to the background carriers induced by the polymer dots and increased tail absorption by the active layer. Based on single carrier device and impedance measurements, polymer dopant can efficiently decrease charge recombination and improve charge carriers mobilities. The obtained achievements pave an approach of molecular doping in affecting the operation of organic solar cells.
Assuntos
Polímeros/química , Energia Solar , Condutividade Elétrica , Fulerenos/química , Estrutura Molecular , Tamanho da Partícula , Processos Fotoquímicos , Propriedades de SuperfícieRESUMO
We used a hydrothermal method to synthesis the solution-processed V2O5 as anode buffer layer, which applied on inverted polymer solar cells based on FTO substrate. The structure of the device is glass/FTO/TiO2/P3HT:PCBM/V2O5/Ag. We discussed the dependence of device performance on the concentrations of V2O5 solution. It is found that when the concentration of V2O5 is 300 microg/ml, the power conversion efficiency (PCE of 2.38%) is the highest, which is much higher than that of the device without anode buffer layer (PCE of only 0.87%). Moreover, it can significantly reduce the energy consumption and make it more cost-effective.
Assuntos
Fontes de Energia Elétrica , Flúor/química , Nanoestruturas/química , Polímeros/química , Energia Solar , Compostos de Estanho/química , Compostos de Vanádio/química , Desenho de Equipamento , Análise de Falha de Equipamento , Flúor/efeitos da radiação , Luz , Teste de Materiais , Nanoestruturas/efeitos da radiação , Soluções , Compostos de Estanho/efeitos da radiação , Compostos de Vanádio/efeitos da radiaçãoRESUMO
The photoresponse of a TiO2 thin film was significantly improved due to the decrease in the Schottky barrier height between Au and TiO2 via the formation of interface dipoles, which was caused by electrostatically self-assembled PEI on the surface of the TiO2 film.