Promising excitonic absorption for efficient perovskite solar cells

IF 2.2 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

European Journal of Inorganic Chemistry Pub Date : 2024-11-12 DOI:10.1016/j.joule.2024.10.012

Biao Li, Yuxin Yao, Chenxia Kan, Pengjie Hang, Jiangsheng Xie, Qixin Yin, Daoyong Zhang, Xuegong Yu, Deren Yang

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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 (E_b), 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 E_b is deeply correlated with the density of vacancy defects in perovskites due to their potential screening effect. Using the precursor engineering, we enhance the E_b 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.

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有望实现激子吸收的高效过氧化物太阳能电池

将过氧化物的带隙调谐到理想带隙可提高过氧化物太阳能电池（PSCs）的功率转换效率（PCE）。在这里，我们证明了可以通过调节激子结合能（Eb），利用包晶石中的激子吸收来实现光带隙的缩小，这直接导致了光电流的增益，从而提高了 PSCs 的 PCE。结合理论和实验研究，我们发现 Eb 与过氧化物中的空位缺陷密度密切相关，这是由于空位缺陷具有潜在的屏蔽效应。利用前驱体工程学，我们通过降低过氧化物薄膜中空位缺陷的密度来提高 Eb。因此，碘化甲脒铅 (FAPbI3) 中激子吸收的改善明显拓宽了光谱响应，从而将冠军 PSC 的效率提高到 26.31%（认证值为 26.09%），这主要是由于光电流的增强。

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来源期刊

European Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

4.30

自引率

4.30%

发文量

419

审稿时长

1.3 months

期刊介绍： The European Journal of Inorganic Chemistry (2019 ISI Impact Factor: 2.529) publishes Full Papers, Communications, and Minireviews from the entire spectrum of inorganic, organometallic, bioinorganic, and solid-state chemistry. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. The following journals have been merged to form the two leading journals, European Journal of Inorganic Chemistry and European Journal of Organic Chemistry: Chemische Berichte Bulletin des Sociétés Chimiques Belges Bulletin de la Société Chimique de France Gazzetta Chimica Italiana Recueil des Travaux Chimiques des Pays-Bas Anales de Química Chimika Chronika Revista Portuguesa de Química ACH—Models in Chemistry Polish Journal of Chemistry The European Journal of Inorganic Chemistry continues to keep you up-to-date with important inorganic chemistry research results.