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Cyclohexylammonium-Based 2D/3D Perovskite Heterojunction with Funnel-Like Energy Band Alignment for Efficient Solar Cells (23.91%)
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-09-20 , DOI: 10.1002/aenm.202102236 Seonghwa Jeong 1 , Seongrok Seo 1 , Hyunwoo Yang 1 , Hyoungmin Park 1 , Sooeun Shin 1 , Hyungju Ahn 2 , Donghwa Lee 3 , Jong Hyeok Park 4 , Nam‐Gyu Park 5 , Hyunjung Shin 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-09-20 , DOI: 10.1002/aenm.202102236 Seonghwa Jeong 1 , Seongrok Seo 1 , Hyunwoo Yang 1 , Hyoungmin Park 1 , Sooeun Shin 1 , Hyungju Ahn 2 , Donghwa Lee 3 , Jong Hyeok Park 4 , Nam‐Gyu Park 5 , Hyunjung Shin 1
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Insufficient charge extraction at the interfaces between light-absorbing perovskites and charge transporting layers is one of the drawbacks of state-of-the-art perovskite solar cells. Surface treatments and/or interface engineering are necessary to approach the Shockley–Queisser limit. In this work, novel 2D layered perovskites, such as CHA2PbI4 (CHAI = cyclohexylammonium iodide) and CHMA2PbI4 (CHMAI = cyclohexylmethylammonium iodide), are introduced in between 3D perovskites and hole transporting layers by a simple solution process and the 2D/3D perovskite heterojunction is formed and confirmed. Spontaneous photoluminescence quenching is observed by efficient hole extraction with a favorable valence band alignment. The charge extraction ability and recombination are directly measured by the transient photocurrent and photovoltage. Moreover, the interface resistance of the devices significantly is decreased to 30% as compared to devices without 2D perovskites. As a result, the devices with 2D/3D perovskite heterojunction exhibit improved power conversion efficiency (PCE) from 20.41% to 23.91% primarily because of the increased open-circuit voltage (1.079 to 1.143 V) and fill factor (78.22% to 84.25%). The results provide a detailed insight into hole extraction and high PCEs with the formation of a 2D/3D perovskite heterojunction.
中文翻译：
基于环己基铵的 2D/3D 钙钛矿异质结与漏斗状能带对准，用于高效太阳能电池 (23.91%)
在吸光钙钛矿和电荷传输层之间的界面处电荷提取不足是最先进的钙钛矿太阳能电池的缺点之一。表面处理和/或界面工程是接近肖克利-奎瑟极限所必需的。在这项工作中，新型二维层状钙钛矿，如 CHA 2 PbI 4（CHAI = 环己基碘化铵）和 CHMA 2 PbI 4(CHMAI = 环己基甲基碘化铵)，通过简单的溶液过程引入 3D 钙钛矿和空穴传输层之间，形成并确认了 2D/3D 钙钛矿异质结。通过有效的空穴提取和有利的价带排列观察到自发的光致发光猝灭。电荷提取能力和复合直接由瞬态光电流和光电压测量。此外，与没有二维钙钛矿的器件相比，器件的界面电阻显着降低了 30%。因此，具有 2D/3D 钙钛矿异质结的器件的功率转换效率 (PCE) 从 20.41% 提高到 23.91%，这主要是因为开路电压（1.079 到 1.143 V）和填充因子（78.22% 到 84.25%）增加了）。
更新日期：2021-11-11
中文翻译：
基于环己基铵的 2D/3D 钙钛矿异质结与漏斗状能带对准，用于高效太阳能电池 (23.91%)
在吸光钙钛矿和电荷传输层之间的界面处电荷提取不足是最先进的钙钛矿太阳能电池的缺点之一。表面处理和/或界面工程是接近肖克利-奎瑟极限所必需的。在这项工作中，新型二维层状钙钛矿，如 CHA 2 PbI 4（CHAI = 环己基碘化铵）和 CHMA 2 PbI 4(CHMAI = 环己基甲基碘化铵)，通过简单的溶液过程引入 3D 钙钛矿和空穴传输层之间，形成并确认了 2D/3D 钙钛矿异质结。通过有效的空穴提取和有利的价带排列观察到自发的光致发光猝灭。电荷提取能力和复合直接由瞬态光电流和光电压测量。此外，与没有二维钙钛矿的器件相比，器件的界面电阻显着降低了 30%。因此，具有 2D/3D 钙钛矿异质结的器件的功率转换效率 (PCE) 从 20.41% 提高到 23.91%，这主要是因为开路电压（1.079 到 1.143 V）和填充因子（78.22% 到 84.25%）增加了）。
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