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Design rules for minimizing voltage losses in high-efficiency organic solar cells
Nature Materials ( IF 41.2 ) Pub Date : 2018-07-16 , DOI: 10.1038/s41563-018-0128-z
Deping Qian , Zilong Zheng , Huifeng Yao , Wolfgang Tress , Thomas R. Hopper , Shula Chen , Sunsun Li , Jing Liu , Shangshang Chen , Jiangbin Zhang , Xiao-Ke Liu , Bowei Gao , Liangqi Ouyang , Yingzhi Jin , Galia Pozina , Irina A. Buyanova , Weimin M. Chen , Olle Inganäs , Veaceslav Coropceanu , Jean-Luc Bredas , He Yan , Jianhui Hou , Fengling Zhang , Artem A. Bakulin , Feng Gao

The open-circuit voltage of organic solar cells is usually lower than the values achieved in inorganic or perovskite photovoltaic devices with comparable bandgaps. Energy losses during charge separation at the donor–acceptor interface and non-radiative recombination are among the main causes of such voltage losses. Here we combine spectroscopic and quantum-chemistry approaches to identify key rules for minimizing voltage losses: (1) a low energy offset between donor and acceptor molecular states and (2) high photoluminescence yield of the low-gap material in the blend. Following these rules, we present a range of existing and new donor–acceptor systems that combine efficient photocurrent generation with electroluminescence yield up to 0.03%, leading to non-radiative voltage losses as small as 0.21 V. This study provides a rationale to explain and further improve the performance of recently demonstrated high-open-circuit-voltage organic solar cells.



中文翻译:

使高效有机太阳能电池中的电压损失最小化的设计规则

有机太阳能电池的开路电压通常低于带隙可比的无机或钙钛矿光伏器件所达到的值。供体-受体界面处的电荷分离过程中的能量损失以及非辐射复合是此类电压损失的主要原因。在这里,我们结合了光谱学和量子化学方法来确定使电压损失最小化的关键规则:(1)供体和受体分子态之间的低能量偏移,以及(2)共混物中低能隙材料的高光致发光产率。遵循这些规则,我们介绍了一系列现有的和新型的供体-受体系统,这些系统将有效的光电流生成与高达0.03%的电致发光效率相结合,从而导致低至0.21 V的非辐射电压损耗。

更新日期:2018-07-18
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