posted on 2021-12-21, 16:04authored byYepin Zhao, Pei Cheng, Hangbo Yang, Minhuan Wang, Dong Meng, Yuan Zhu, Ran Zheng, Tengfei Li, Anni Zhang, Shaun Tan, Tianyi Huang, Jiming Bian, Xiaowei Zhan, Paul S. Weiss, Yang Yang
Semitransparent organic photovoltaics
(OPVs) have drawn significant
attention for their promising potential in the field of building integrated
photovoltaics such as energy-generating greenhouses. However, the
conflict between the need to attain satisfying average visible transmittances
for greenhouse applications and the need to maintain high power conversion
efficiencies is limiting the commercialization of semitransparent
OPVs. A major manifestation of this issue is the undermining of charge
carrier extraction efficiency when opaque, visible-light-absorbing
electrodes are substituted with semitransparent ones. Here, we incorporated
a dual-function p-type compatible interlayer to modify
the interface of the hole-transporting layer and the ultrathin electrode
of the semitransparent devices. We find that the p-type interlayer not only enhances the charge carrier extraction
of the electrode but also increases the light transmittance in the
wavelength range of 400–450 nm, which covers most of the photosynthetic
absorption spectrum. The modified semitransparent devices reach a
power conversion efficiency of 13.7% and an average visible transmittance
of 22.2%.