Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells
Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells
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DOI：
10.1021/acsmaterialslett.2c00275
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发表时间：
2022-08
影响因子：
11.4
通讯作者：
M. A. Kamarudin;S. R. Sahamir;K. Nishimura;S. Iikubo;K. Yoshino;T. Minemoto;Qing Shen;S. Hayase
中科院分区：
文献类型：
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作者：
M. A. Kamarudin;S. R. Sahamir;K. Nishimura;S. Iikubo;K. Yoshino;T. Minemoto;Qing Shen;S. Hayase
无铅钙钛矿太阳能电池由于对有毒材料和标准合规性的环境关注而吸引了钙钛矿研究领域的许多人的注意。锡基钙钛矿材料由于其相似的光电性能而被选为铅基钙钛矿的理想替代物。然而，锡钙钛矿太阳能电池的性能仍然远远低于铅钙钛矿。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。在这项研究中，A-位点阳离子取代已进行使用二甲基铵阳离子（DMA+）的形式的二甲基碘化铵（DMAI）盐。优化的DMAI浓度提高了锡钙钛矿太阳能电池的性能，使开路电压（VOC）提高了10%以上。DMA+取代得到了更好的表面形貌。从Mott-Schottky测量，已经获得了更高的内建电位，这有助于电荷载流子提取。此外，从X射线光电子能谱测量，锡氧化已被抑制，导致低空穴载流子密度。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是重要的。
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.