Engineering and Technology

Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating

Y. Zhang, K. Liu, et al.

Experience the groundbreaking advancements in organic solar cell technology with remarkable power conversion efficiency achieved through a novel graded bulk-heterojunction strategy. This innovative research by Ying Zhang and colleagues showcases the potential for eco-friendly energy solutions that do not compromise performance.

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Abstract

This work demonstrates an effective graded bulk-heterojunction (G-BHJ) strategy using nonhalogenated solvent sequential deposition for non-fullerene acceptor (NFA) organic solar cells (OSCs). Spin-coated G-BHJ OSCs achieved a 17.48% power conversion efficiency (PCE), with thick OSCs maintaining high PCEs (16.25% for 300 nm, 14.37% for 500 nm). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) revealed beneficial polymer/NFA composition and crystallinity gradients. Furthermore, a blade-coated G-BHJ OSC achieved a record 16.77% PCE using nonhalogenated solvents in open air, showcasing the potential for efficient and eco-friendly OSCs.

Publisher

Nature Communications

Published On

Aug 10, 2021

Authors

Ying Zhang, Kuan Liu, Jiaming Huang, Xinxin Xia, Jiupeng Cao, Guangming Zhao, Patrick W. K. Fong, Ye Zhu, Feng Yan, Yang Yang, Xinhui Lu, Gang Li

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