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Tailoring the Alkalinity of SnO2 Colloidal Suspension for High-Performance and Stable Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2024-05-20 , DOI: 10.1002/solr.202400292 Zhiliang Shao 1 , Ming Wang 1 , Xikang Li 1 , Hechao Zou 1 , Fanghao Ye 1 , Siyang Liu 1 , Hang Zhou 2 , Ping Xu 1 , Guijun Li 1
Solar RRL ( IF 6.0 ) Pub Date : 2024-05-20 , DOI: 10.1002/solr.202400292 Zhiliang Shao 1 , Ming Wang 1 , Xikang Li 1 , Hechao Zou 1 , Fanghao Ye 1 , Siyang Liu 1 , Hang Zhou 2 , Ping Xu 1 , Guijun Li 1
Affiliation
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The commercial tin oxide (SnO2) colloidal suspension is widely utilized as an electron transport layer (ETL) in high-performance perovskite solar cells (PSCs). However, despite significant efforts have been proposed to address bulk transport and interface recombination issues, the PSC efficiency is still limited to around 25%. In this study, the crucial role of the physicochemical characteristics of the SnO2 colloidal suspension in shaping the morphology, electrical properties, and optical properties of the SnO2 ETL is investigated. By controlling the pH value of the SnO2 solution with weak acids such as carbonic acid, the reassembly of metal oxide nanoparticles into smaller sizes with more homogeneous dispersion and dense interconnections is successfully induced. Consequently, the resulting SnO2 ETL exhibits enhanced crystallinity, high conductivity, low surface defects, and high optical transmittance. As a result, the efficiency of the target PSC is increased from 23.10% (control device) to 24.70%. This improvement is attributed to higher voltage, photocurrent, and fill factor compared to the relevant control samples. A similar device improvement using phosphoric acid is observed, indicating that the approach represents a universal technique to further enhance the quality of SnO2 ETL for large-area, high-efficiency, and stable PSCs.
中文翻译：
调整 SnO2 胶体悬浮液的碱度以实现高性能和稳定的钙钛矿太阳能电池
商业氧化锡（SnO 2 ）胶体悬浮液被广泛用作高性能钙钛矿太阳能电池（PSC）中的电子传输层（ETL）。然而，尽管已经提出了重大努力来解决批量传输和界面重组问题，PSC 效率仍然限制在 25% 左右。在本研究中，研究了 SnO 2 胶体悬浮液的物理化学特性在塑造 SnO 2 ETL 的形态、电学性能和光学性能方面的关键作用。通过用碳酸等弱酸控制 SnO 2 溶液的 pH 值，成功诱导金属氧化物纳米颗粒重新组装成更小尺寸、更均匀的分散和致密的互连。因此，所得的SnO 2 ETL表现出增强的结晶度、高电导率、低表面缺陷和高透光率。结果，目标PSC的效率从23.10%（控制装置）增加到24.70%。与相关对照样品相比，这种改进归因于更高的电压、光电流和填充因子。使用磷酸观察到类似的设备改进，表明该方法代表了一种通用技术，可进一步提高大面积、高效和稳定 PSC 的 SnO 2 ETL 质量。
更新日期：2024-05-20
中文翻译：
调整 SnO2 胶体悬浮液的碱度以实现高性能和稳定的钙钛矿太阳能电池
商业氧化锡（SnO 2 ）胶体悬浮液被广泛用作高性能钙钛矿太阳能电池（PSC）中的电子传输层（ETL）。然而，尽管已经提出了重大努力来解决批量传输和界面重组问题，PSC 效率仍然限制在 25% 左右。在本研究中，研究了 SnO 2 胶体悬浮液的物理化学特性在塑造 SnO 2 ETL 的形态、电学性能和光学性能方面的关键作用。通过用碳酸等弱酸控制 SnO 2 溶液的 pH 值，成功诱导金属氧化物纳米颗粒重新组装成更小尺寸、更均匀的分散和致密的互连。因此，所得的SnO 2 ETL表现出增强的结晶度、高电导率、低表面缺陷和高透光率。结果，目标PSC的效率从23.10%（控制装置）增加到24.70%。与相关对照样品相比，这种改进归因于更高的电压、光电流和填充因子。使用磷酸观察到类似的设备改进，表明该方法代表了一种通用技术，可进一步提高大面积、高效和稳定 PSC 的 SnO 2 ETL 质量。
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