带隙
材料科学
有机太阳能电池
光电子学
混合太阳能电池
接受者
工程物理
聚合物太阳能电池
太阳能电池
聚合物
凝聚态物理
物理
工程类
复合材料
作者
Tingting Jiang,G. Zhang,Ruoxi Xia,Jun Huang,X. Li,M. Wang,Hin-Lap Yip,Yong Cao
标识
DOI:10.1016/j.mtener.2021.100807
摘要
Recent advances in organic solar cells (OSCs) based on large-bandgap donors and low-bandgap non-fullerene acceptors (NFAs) have increased the power conversion efficiency (PCE) of OSCs to ~18%. However, these state-of-the-art OSCs have strong absorption in the visible region, limiting their application in semitransparent organic solar cells (STOSCs). In this study, an all-low-bandgap system based on a low-bandgap polymer donor (PM2) and a low-bandgap NFA (Y6-BO), was introduced as the light-harvesting layer for STOCSs with absorption mainly localized in the near-infrared (NIR) spectrum from 600 to 900 nm. The corresponding opaque OSCs exhibited the highest PCE among reported all-low-bandgap OSC systems, and the corresponding STOSCs showed higher visible light transmittances (VLTs) and light utilization efficiencies (LUEs) than the reference devices based on state-of-the-art PM6:Y6-BO OSC system with broad range absorption from visible to NIR. Optical simulations predicted that the PM2:Y6-BO-based STOSCs have a greater potential to realize higher VLTs and PCEs and better PCE retention (PCE semitransparent /PCE opaque ) than those from the PM6:Y6-BO-based STOSCs. Guided by these simulations, PM2-based STOSCs with VLTs exceeding 40% and PCEs of ~6% were achieved. Further recombination analysis suggested that the PM2-based devices experienced more severe charge recombination and energy losses, indicating there is further room for PCE improvement by designing new all-low-bandgap systems. Overall, this work shows the great potential of all-low-bandgap systems in realizing STOSCs with high PCEs and VLTs, which is promising for the commercialization of OSCs as power-generating window applications. • A highly efficient all-low-bandgap opaque OSC with a power conversion efficiency (PCE) of 11.1% was constructed. • The all-low-bandgap semitransparent OSCs showed higher light utilization efficiencies and better PCE retention. • A high-performance semitransparent OSC with a visible light transmittance of ~43% and a PCE of ~6% was realized.
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