Charge generation in organic solar cells: Journey toward 20% power conversion efficiency
Charge generation in organic solar cells: Journey toward 20% power conversion efficiency
复制标题
DOI：
10.1002/agt2.280
复制
发表时间：
2022-10
期刊：
影响因子：
18.8
通讯作者：
Yasunari Tamai
中科院分区：
文献类型：
--
作者：
Yasunari Tamai
有机太阳能电池（OSC）的功率转换效率通常远远落后于无机太阳能电池。然而，由于许多研究人员的巨大贡献，OSC的功率转换效率迅速提高，现在超过19%。在此期间，在获得有价值的知识的同时，在OSC中的电荷产生机制已经引起了激烈的争论。这篇综述强调了基础和前沿研究，解释了为什么OSC可以如此有效地产生光电流。特别是，激子扩散到施主：受主界面，在施主：受主界面的电荷转移，和电荷转移态的长程空间解离的量子力学的观点进行了讨论。虽然在这一领域尚未达成普遍共识，但最近的时间分辨光谱测量提供了重要的生物物理见解，可以帮助更好地理解OSC中的电荷产生机制。基于这些观察，未来的研究方向，实现进一步改善OSC的性能进行了讨论。
The power conversion efficiencies of organic solar cells (OSCs) have routinely lagged far behind those of their inorganic counterparts. However, owing to the enormous contributions of many researchers, the power conversion efficiencies of OSCs have rapidly improved and now exceed 19%. The charge generation mechanisms in OSCs have been heavily debated during this period while acquiring valuable knowledge. This review highlights fundamental and cutting‐edge research that rationalizes why OSCs can generate photocurrent so efficiently. In particular, a photophysicist's views on exciton diffusion to donor:acceptor interfaces, charge transfer at the donor:acceptor interface, and long‐range spatial dissociation of charge transfer states are discussed. Although a general consensus in this area has not been reached yet, recent time‐resolved spectroscopic measurements provide important photophysical insights that can help achieving a better understanding of the charge generation mechanism in OSCs. Based on these observations, future research directions for realizing further improvements in OSC performance are discussed.