Selenium-Containing Organic Photovoltaic Materials,Accounts of Chemical Research

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Selenium-Containing Organic Photovoltaic Materials
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2021-10-04 , DOI: 10.1021/acs.accounts.1c00443
Baobing Fan , Francis Lin , Xin Wu , Zonglong Zhu , Alex K-Y Jen ₁

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Organic photovoltaics (OPVs) with a photoactive layer containing a blend of organic donor and acceptor species are considered to be a promising technology for clean energy owing to their unique flexible form factor and good solution processability that can potentially address the scalability challenges. The delicate designs of both donors and acceptors have significantly enhanced the power conversion efficiency of OPVs to more than 18%. Nonfullerene small-molecule acceptors (NFAs) have played a critical role in enhancing the short-circuit current density (J_SC) by efficiently harvesting near-infrared (NIR) sunlight. To take full advantage of the abundant NIR photons, the optical band gap of NFAs should be further reduced to improve the performance of OPVs. Incorporating highly polarizable selenium atoms onto the backbone of organic conjugated materials has been proven to be an effective way to decrease their optical band gap. For example, a selenium-substituted NFA recently developed by our group has attained a J_SC of approximate 27.5 mA cm^–2 in OPV devices, surpassing those of most emerging photovoltaic systems. Inspired by this advance, we concentrate on the topic of selenium-containing materials in this Account to incite readers’ interest in further exploring this series of materials.

中文翻译：

含硒有机光伏材料

具有包含有机供体和受体物种混合物的光敏层的有机光伏 (OPV) 被认为是一种有前途的清洁能源技术，因为它们具有独特的灵活外形和良好的溶液可加工性，可以潜在地解决可扩展性挑战。供体和受体的精巧设计使OPV的功率转换效率显着提高至18%以上。非富勒烯小分子受体 (NFAs) 在提高短路电流密度方面发挥了关键作用 ( J _SC) 通过有效地收集近红外 (NIR) 阳光。为了充分利用丰富的近红外光子，应进一步减小 NFA 的光学带隙，以提高 OPV 的性能。将高度可极化的硒原子结合到有机共轭材料的骨架上已被证明是降低其光学带隙的有效方法。例如，我们小组最近开发的一种硒取代的 NFA在 OPV 设备中获得了约 27.5 mA cm ^–2的J _SC，超过了大多数新兴光伏系统的J _SC。受这一进展的启发，我们在本篇文章中将重点放在含硒材料的主题上，以激发读者进一步探索该系列材料的兴趣。

更新日期：2021-10-19

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