Simultaneous Enhanced Device Efficiency and Color Neutrality in Semitransparent Organic Photovoltaics Employing a Synergy of Ternary Strategy and Optical Engineering

Authors：Yuan, Xinxin; Sun, Rui; Wu, Yao; Wang, Tao; Wang, Yuheng; Wang, Wei; Yu, Yue; Guo, Jing; Wu, Qiang; Min, Jie^*

Source：Advanced Functional Materials, 2022, 32(22): 2200107.

DOI：10.1002/adfm.202200107

• color neutrality
• color rendering index
• power conversion efficiency
• semitransparent organic photovoltaics
• ternary systems

Power conversion efficiency (PCE) and color rendering index (CRI) are two important parameters for realizing the potential application of semitransparent organic photovoltaics (ST-OPVs) into the field of building-integrated photovoltaics (BIPVs). Herein, to extend the PCE limit while showing desirable neutral-colored perception, formally in a trade-off relationship, of ST-OPVs, new ternary photoactive layers composed of polymer donor PM6-Ir1, non-fullerene acceptor BTP-eC9, and fullerene acceptor PC71BM as the third component are employed, which are effective to improve opaque device efficiency while modulating CRI in relevant ternary blends. Furthermore, multifunctional ST-OPVs are realized via simultaneously optimizing the content of PC71BM in acceptors and employing a simple photonic reflector, leading to not only excellent neutral color perception with a CRI of 96.5 but also a PCE of 14.09% with an average visible transmittance higher than 20%. Vivid backgrounds can be clearly seen through the 1-DBR-based ternary ST-OPVs. Overall, these results represent the best-performing multifunctional ST-OPVs, and this synergistic effect can pave the road for ST-OPVs as promising BIPVs of high device performance and good color neutrality.

• Institution
  武汉大学; 郑州大学