Trivalent Metal Chloride Doping for Interfacial Passivation and Enhanced Charge Transfer in Wide Bandgap Perovskite Solar Cells

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-11-30 DOI:10.1021/acsaem.4c0215710.1021/acsaem.4c02157

Yieon Park, Ryosuke Nishikubo*, Mikhail Pylnev, Ryoji Shimomura and Akinori Saeki*,

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Abstract

Wide-bandgap (WBG) perovskites with high Br content suffer from halide segregation owing to defect-promoting ion migration. The resultant phase segregation causes energy and charge transfer from Br-rich to I-rich areas, resulting in a large voltage loss in WBG perovskite solar cells (PSCs). Herein, we report the multifunctional effects of trivalent metal chloride doping on the efficiency, stability, and charge transfer of WBG PSCs, which were monitored by using in situ photoabsorption and photoluminescence (PL) spectroscopy. Among the examined dopants (BiCl₃, SbCl₃, and InCl₃), InCl₃ effectively passivated the surface of the perovskite grains and prevented halide segregation with the addition of a small amount (1 mol %) to the precursor solutions. Consequently, the In-doped FA_0.8MA_0.15Cs_0.05PbI₂Br PSC (FA: formamidinium; MA: methylammonium; band gap: 1.73 eV) improved its power conversion efficiency from 16.06 to 17.54% owing to passivation and enhanced electron transfer at the bottom interface. Furthermore, the In-doped PSC exhibited dramatically improved stability during storage and voltage scanning. Our work highlights the critical role of dopants in the formation of WBG perovskite films and their electronic properties, offering a way to improve and stabilize WBG PSCs.

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三价金属氯离子掺杂在宽禁带钙钛矿太阳能电池中的界面钝化和增强电荷转移

高Br含量的宽禁带钙钛矿由于缺陷离子迁移导致卤化物偏析。由此产生的相偏析导致能量和电荷从富br区转移到富i区，导致WBG钙钛矿太阳能电池（PSCs）的电压损失很大。本文报道了三价金属氯离子掺杂对WBG PSCs的效率、稳定性和电荷转移的多功能影响，并利用原位光吸收和光致发光（PL）光谱对其进行了监测。在所检测的掺杂剂（BiCl3， SbCl3和InCl3）中，在前驱体溶液中添加少量（1 mol %）的InCl3可以有效地钝化钙钛矿颗粒表面，防止卤化物偏析。因此，掺入FA0.8MA0.15Cs0.05PbI2Br PSC (FA: formamidinium；马:methylammonium;带隙：1.73 eV)将其功率转换效率从16.06提高到17.54%，这是由于钝化和增强了底部界面的电子转移。此外，在存储和电压扫描过程中，掺in的PSC表现出显著提高的稳定性。我们的工作强调了掺杂剂在WBG钙钛矿薄膜形成及其电子性能中的关键作用，为改善和稳定WBG PSCs提供了一种方法。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.