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Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells
ACS Materials Letters ( IF 9.6 ) Pub Date : 2022-08-24 , DOI: 10.1021/acsmaterialslett.2c00275 Muhammad Akmal Kamarudin 1 , Shahrir Razey Sahamir 1 , Kohei Nishimura 1 , Satoshi Iikubo 2 , Kenji Yoshino 3 , Takashi Minemoto 4 , Qing Shen 5 , Shuzi Hayase 1
ACS Materials Letters ( IF 9.6 ) Pub Date : 2022-08-24 , DOI: 10.1021/acsmaterialslett.2c00275 Muhammad Akmal Kamarudin 1 , Shahrir Razey Sahamir 1 , Kohei Nishimura 1 , Satoshi Iikubo 2 , Kenji Yoshino 3 , Takashi Minemoto 4 , Qing Shen 5 , Shuzi Hayase 1
Affiliation
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Lead-free perovskite solar cells have attracted attention to many in the field of perovskite research due to environmental concern over toxic materials and standards compliance. Tin-based perovskite materials have been selected as the ideal alternative to lead-based perovskite due to their similar optoelectronic properties. However, the performance of tin perovskite solar cells is still much lower than their lead perovskite counterparts. Various strategies have been introduced in order to enhance the efficiency of tin perovskite solar cells. In this research, A-site cation substitution has been performed using dimethylammonium cation (DMA+) in the form of dimethylammonium iodide (DMAI) salt. An optimized concentration of DMAI enhanced the performance of tin perovskite solar cells to a more than 10% boosted higher open-circuit voltage (VOC). A better surface morphology was obtained with DMA+ substitution. From Mott–Schottky measurements, a higher built-in potential has been obtained, which helped with charge carrier extraction. Furthermore, from X-ray photoelectron spectroscopy measurements, tin oxidation has been suppressed, leading to low hole carrier density. This work provides evidence that controlling the charge carrier density in tin-based perovskite solar cells is important to fabricating high performance devices.
中文翻译：
通过二甲基铵取代的锡钙钛矿太阳能电池抑制缺陷和陷阱密度
由于对有毒材料和标准合规性的环境关注，无铅钙钛矿太阳能电池已引起钙钛矿研究领域的许多关注。由于具有相似的光电特性，锡基钙钛矿材料已被选为铅基钙钛矿的理想替代品。然而，锡钙钛矿太阳能电池的性能仍远低于铅钙钛矿电池。为了提高锡钙钛矿太阳能电池的效率，已经引入了各种策略。在本研究中，使用二甲基铵阳离子（DMA +) 以二甲基碘化铵 (DMAI) 盐的形式存在。优化的 DMAI 浓度将锡钙钛矿太阳能电池的性能提高到超过 10% 的更高开路电压 ( V OC )。使用 DMA +取代获得了更好的表面形态。从莫特-肖特基测量中，获得了更高的内建电位，这有助于电荷载流子的提取。此外，通过 X 射线光电子能谱测量，锡的氧化得到抑制，导致空穴载流子密度低。这项工作提供的证据表明，控制锡基钙钛矿太阳能电池中的电荷载流子密度对于制造高性能器件很重要。
更新日期：2022-08-24
中文翻译：
通过二甲基铵取代的锡钙钛矿太阳能电池抑制缺陷和陷阱密度
由于对有毒材料和标准合规性的环境关注，无铅钙钛矿太阳能电池已引起钙钛矿研究领域的许多关注。由于具有相似的光电特性，锡基钙钛矿材料已被选为铅基钙钛矿的理想替代品。然而，锡钙钛矿太阳能电池的性能仍远低于铅钙钛矿电池。为了提高锡钙钛矿太阳能电池的效率，已经引入了各种策略。在本研究中，使用二甲基铵阳离子（DMA +) 以二甲基碘化铵 (DMAI) 盐的形式存在。优化的 DMAI 浓度将锡钙钛矿太阳能电池的性能提高到超过 10% 的更高开路电压 ( V OC )。使用 DMA +取代获得了更好的表面形态。从莫特-肖特基测量中，获得了更高的内建电位，这有助于电荷载流子的提取。此外，通过 X 射线光电子能谱测量，锡的氧化得到抑制，导致空穴载流子密度低。这项工作提供的证据表明，控制锡基钙钛矿太阳能电池中的电荷载流子密度对于制造高性能器件很重要。
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