Biao Li, Yuxin Yao, Chenxia Kan, Pengjie Hang, Jiangsheng Xie, Qixin Yin, Daoyong Zhang, Xuegong Yu, Deren Yang
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引用次数: 0
Abstract
Tuning the band gap of perovskites toward the ideal band gap enables the enhancement of the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Here, we demonstrate that the optical band-gap narrowing can be achieved by employing the excitonic absorption in perovskites through tuning their exciton binding energy (Eb), which directly leads to a photocurrent gain and hence improves the PCE of PSCs. With combined theoretical and experimental studies, it is revealed that the Eb is deeply correlated with the density of vacancy defects in perovskites due to their potential screening effect. Using the precursor engineering, we enhance the Eb by decreasing the density of vacancy defects in perovskites films. As a result, the improved excitonic absorption in formamidinium lead iodide (FAPbI3) obviously broadens the spectral response and thus boosts the efficiency of the champion PSC up to 26.31% (certified 26.09%), mainly due to an enhanced photocurrent.
期刊介绍：
Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.
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