Multifunctional Semitransparent Organic Photovoltaics with High-Throughput Screened Infrared Reflector
Baozhong Deng, Kaiwen Zheng, Zihan Wang, Luqiao Yin, Hongliang Dong, Chengxi Zhang, Mona Tréguer‐Delapierre, Kekeli N’Konou, B. Grandidier, Shenghao Wang, Jianhua Zhang, Tao Xu
Abstract
Multifunctional semitransparent organic photovoltaics (ST-OPVs) combining power generation, light transparency, and heat rejection have emerged as a promising technology for application in building-integrated photovoltaic systems, but maximizing all of these features simultaneously is challenging. Herein, we show that high-throughput optical screening is essential to guide the design of infrared reflectors and enhance their synergy with organic absorbers. Taking advantage of a volatile additive, 1,3,5-trichlorobenzene, to improve the crystallinity of the binary PM6:L8-BO active layer, we developed an optimized infrared reflector, consisting of a Na 3 AlF 6 (160 nm)/ZnSe (190 nm) bilayer, which concomitantly increases all of the key parameters of the reflector-free device. High-performance multifunctional ST-OPVs with a power conversion efficiency of 15.19%, an average photopic transmittance of 30.57%, a color rendering index of 81.86, and an infrared rejecting rate over 90% are demonstrated, providing practical prospects for future sustainable building-integrated photovoltaic systems.