Efficient Semitransparent Organic Solar Cells with CRI over 90% Enabled by an Ultralow-Bandgap A-DA'D-A Small Molecule Acceptor

作者：Xu, Xiang; Wei, Qingya; Zhou, Zhisheng; He, Haozhe; Tian, Jingjing; Yip, Hin-Lap; Fu, Yuang; Lu, Xinhui; Zhou, Yonghua; Li, Yongfang; Zou, Yingping^*

来源：Advanced Functional Materials, 2023.

DOI：10.1002/adfm.202305017

• color rendering indexes
• light utilization efficiency
• low-bandgap acceptors
• optical modeling
• semitransparent organic solar cells

Semitransparent organic solar cells (ST-OSCs) can function as power-generating windows due to their ability to allow visible light go-through for human eyesight while absorbing low-energy photons in the near-infrared region for photocurrent generation. In this regard, effective ST-OSCs with high light utilization efficiency (LUE) and color rendering index (CRI) can be developed via a synergistic material and device engineering strategy. Herein, an A-DA'D-A acceptor BZO-4Cl is synthesized with an ultralow optical bandgap of 1.26 eV and bathochromically shifted absorption of roughly 60 nm with respect to Y6. Initially, the opaque devices using PTB7-Th as the donor show a high power conversion efficiency (PCE) of 14.12% , which can be listed as one of the highest efficiencies for the PTB7-Th-based OSCs so far. Then, through these efforts of optimizations in the bulk-heterojunction(BHJ) composition, top electrodes and anti-reflection layer, the cutting-edge ST-OSC demonstrates a high LUE of 4.02%, and a CRI of 90.67%, making it one of the best-performing ST-OSCs with both high LUE and CRI values. These results indicate that the ST-OSCs presented in this study have significant potential for use in applications that possess transparent visible light and energy-generation functions. @@@ A color-neutral semitransparent organic solar cell (ST-OSC) is fabricated using a new near-infrared acceptor BZO-4Cl. By some optimization strategies , as a consequence, the ST-OSC shows light utilization efficiency (LUE) of 4.02% and color rendering index (CRI) of 90.67%, which are among the best ST-OSCs with both LUE and CRI values.image

• 单位
  中国科学院