Enhancing the photocurrent in poly(3-hexylthiophene)/[6,6]-phenyl C61 butyric acid methyl ester bulk heterojunction solar cells by using poly(3-hexylthiophene) as a buffer layer

Liang, C.-W.C.-W.LiangSu, W.-F.W.-F.SuWEI-FANG SU2020-06-232020-06-23200900036951https://scholars.lib.ntu.edu.tw/handle/123456789/504250This work presents an approach for improving the unfavorable vertical composition gradients of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) in the photoactive layer of bulk heterojunction solar cells. The proposed method involves simply depositing a thin layer of P3HT on top of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) prior to the P3HT:PCBM blend is spin coated. The results from photoluminescence and photovoltaic measurements indicate that incorporating this P3HT layer significantly enhances the electron blocking ability of PEDOT:PSS, the efficiency of photoinduced electron transfer and the photocurrent of the device, resulting in an improvement of the power conversion efficiency from 3.98% to 5.05%. © 2009 American Institute of Physics.[SDGs]SDG7Bulk heterojunction solar cells; Butyric acids; Composition gradient; Electron blocking; Ethylenedioxythiophenes; Methyl esters; PEDOT:PSS; Photo-induced electron transfer; Photoactive layers; Photovoltaic measurements; Poly (3-hexylthiophene); Power conversion efficiencies; Thin layers; Acids; Carrier mobility; Conversion efficiency; Deposition; Electron transitions; Esterification; Esters; Fatty acids; Photocurrents; Photovoltaic cells; Semiconductor quantum wells; Solar cells; Styrene; HeterojunctionsEnhancing the photocurrent in poly(3-hexylthiophene)/[6,6]-phenyl C61 butyric acid methyl ester bulk heterojunction solar cells by using poly(3-hexylthiophene) as a buffer layerjournal article10.1063/1.3242006