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Enhanced Efficiency of Air-Stable CsPbBr3 Perovskite Solar Cells by Defect Dual Passivation and Grain Size Enlargement with a Multifunctional Additive.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-14 , DOI: 10.1021/acsami.0c08827
Wenyu Zhang 1 , Xiaojie Liu 1 , Benlin He 1 , Jingwei Zhu 1 , Xueke Li 1 , Kaixiang Shen 1 , Haiyan Chen 1 , Yanyan Duan 2 , Qunwei Tang 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-07-14 , DOI: 10.1021/acsami.0c08827
Wenyu Zhang 1 , Xiaojie Liu 1 , Benlin He 1 , Jingwei Zhu 1 , Xueke Li 1 , Kaixiang Shen 1 , Haiyan Chen 1 , Yanyan Duan 2 , Qunwei Tang 3
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The perovskite solar cells (PSCs) based on cesium lead bromide (CsPbBr3) with outstanding environmental stability and low preparation cost are regarded as one of the most promising photovoltaic devices for commercial applications. However, the performance of CsPbBr3 PSCs can be badly deteriorated by the intense charge recombination arising from the ionic defects at the grain boundaries of perovskite film. To cope with this issue, we adopt an amino acid of l-lysine with two amino and one carboxyl groups as a chemical additive to incorporate into perovskite film to simultaneously anchor the uncoordinated Pb2+ (Cs+) and halogen ion defects. Further, the grain size of CsPbBr3 perovskite is boosted from 688 to over 1000 nm after l-lysine incorporation as a result of the decreased nucleation rate and the sufficient growth of perovskite, which effectively reduce the grain boundaries for load defects. As expected, the optimized device achieves a best power conversion efficiency of 9.69% attributed to the remarkably reduced charge recombination and enhanced charge extraction arising from the efficient defects dual-passivation and enlarged grain size of perovskite film as well as the improved energy level alignment at the device interface after the introduction of l-lysine, which is elevated by 61.23% in comparison to 6.01% efficiency of the pristine one. Moreover, the unencapsulated device with l-lysine incorporation exhibits remarkable long-term stability in air with 80% RH at 25 °C and 0% RH at 80 °C as well as under continuous illumination conditions. This work provides an effective multifunctional additive for imperfection passivation and grain size enlargement of perovskite to build PSCs with high efficiency and stability.
中文翻译:
通过缺陷双重钝化和多功能添加剂的晶粒扩大,提高了空气稳定性CsPbBr3钙钛矿型太阳能电池的效率。
基于溴化铯铯(CsPbBr 3)的钙钛矿太阳能电池(PSC)具有出色的环境稳定性和较低的制备成本,被认为是商业应用中最有前途的光伏器件之一。但是,钙钛矿膜晶界处的离子缺陷引起的强烈的电荷复合会严重破坏CsPbBr 3 PSC的性能。为了解决该问题,我们采用具有两个氨基和一个羧基的1-赖氨酸氨基酸作为化学添加剂,将其掺入钙钛矿膜中,以同时锚定未配位的Pb 2+(Cs +)和卤素离子缺陷。此外,CsPbBr 3的晶粒尺寸加入l-赖氨酸后,钙钛矿从688纳米增加到1000纳米以上,这是由于成核速率降低和钙钛矿的充分生长而产生的,钙钛矿有效地减小了负载缺陷的晶界。正如预期的那样,优化的器件实现了9.69%的最佳功率转换效率,这归因于有效缺陷的双重钝化和钙钛矿薄膜的晶粒尺寸的增大以及在120℃时能级的改善,从而显着减少了电荷复合并增强了电荷提取引入l-赖氨酸后的设备界面,与原始相比,效率提高了61.23%,而原始赖氨酸的效率提高了6.01%。此外,与未包封的装置升掺入赖氨酸在空气中表现出卓越的长期稳定性,在25°C下相对湿度为80%,在80°C下相对湿度为0%以及在连续照明条件下。这项工作为钙钛矿的缺陷钝化和晶粒尺寸增大提供了一种有效的多功能添加剂,从而可以高效且稳定地构建PSC。
更新日期:2020-08-12
中文翻译:
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通过缺陷双重钝化和多功能添加剂的晶粒扩大,提高了空气稳定性CsPbBr3钙钛矿型太阳能电池的效率。
基于溴化铯铯(CsPbBr 3)的钙钛矿太阳能电池(PSC)具有出色的环境稳定性和较低的制备成本,被认为是商业应用中最有前途的光伏器件之一。但是,钙钛矿膜晶界处的离子缺陷引起的强烈的电荷复合会严重破坏CsPbBr 3 PSC的性能。为了解决该问题,我们采用具有两个氨基和一个羧基的1-赖氨酸氨基酸作为化学添加剂,将其掺入钙钛矿膜中,以同时锚定未配位的Pb 2+(Cs +)和卤素离子缺陷。此外,CsPbBr 3的晶粒尺寸加入l-赖氨酸后,钙钛矿从688纳米增加到1000纳米以上,这是由于成核速率降低和钙钛矿的充分生长而产生的,钙钛矿有效地减小了负载缺陷的晶界。正如预期的那样,优化的器件实现了9.69%的最佳功率转换效率,这归因于有效缺陷的双重钝化和钙钛矿薄膜的晶粒尺寸的增大以及在120℃时能级的改善,从而显着减少了电荷复合并增强了电荷提取引入l-赖氨酸后的设备界面,与原始相比,效率提高了61.23%,而原始赖氨酸的效率提高了6.01%。此外,与未包封的装置升掺入赖氨酸在空气中表现出卓越的长期稳定性,在25°C下相对湿度为80%,在80°C下相对湿度为0%以及在连续照明条件下。这项工作为钙钛矿的缺陷钝化和晶粒尺寸增大提供了一种有效的多功能添加剂,从而可以高效且稳定地构建PSC。