High-Efficiency Y6 Homojunction Organic Solar Cells Enabled by a Secondary Hole Transport Layer.

ABSTRACT: Y6 homojunction solar cells are prepared using the exciton/electron-blocking material poly[9,9-di-n-octylfluorene-alt-N-(4-sec-butylphenyl)diphenylamine] (TFB) as a secondary hole transport layer material in conjunction with PEDOT:PSS. Using this device architecture, a maximum power conversion efficiency (PCE) of 2.57% is achieved, which is the highest reported thus far for a solution-processed small molecule homojunction organic photovoltaic (OPV) device. The devices display an unexpectedly low thickness dependence, with the average PCE only decreasing by ≈17% when the Y6 active layer thickness is increased from 80 to 300 nm. Time-resolved photoluminescence measurements show that the TFB does not contribute to charge generation through photoinduced hole or electron transfer. However, tran

SUBMITTER: McAnally S 

PROVIDER: S-EPMC11855233 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature