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Diluted-CdS Quantum Dot-Assisted SnO2 Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-03-31 , DOI: 10.1021/acsami.1c00896 Zheng Lv 1 , Li He 1 , Haipeng Jiang 1 , Xiaojun Ma 1 , Fengyou Wang 1 , Lin Fan 1 , Maobin Wei 1 , Jinghai Yang 1 , Lili Yang 1 , Nannan Yang 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-03-31 , DOI: 10.1021/acsami.1c00896 Zheng Lv 1 , Li He 1 , Haipeng Jiang 1 , Xiaojun Ma 1 , Fengyou Wang 1 , Lin Fan 1 , Maobin Wei 1 , Jinghai Yang 1 , Lili Yang 1 , Nannan Yang 2
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An electron transport layer (ETL) with excellent conductivity and suitable band alignment plays a key role in accelerating charge extraction and transfer for achieving highly efficient planar perovskite solar cells (PSCs). Herein, a novel diluted-cadmium sulfide quantum dot (CdS QD)-assisted SnO2 ETL has been developed with a low-temperature fabrication process. The slight addition of CdS QDs first enhances the crystallinity and flatness of SnO2 ETLs so that it provides a promising workstation to obtain high-quality perovskite absorption layers. It also amazingly increases the conductivity of the SnO2 ETL by an order of magnitude and regulates the energy level matching between the SnO2 ETL and perovskite. These outstanding properties greatly accelerate the charge extraction and transfer. Thus, the MAPbI3-based PSCs with such a diluted-CdSQD-assisted SnO2 ETL achieve a maximum power conversion efficiency of 20.78% and obtain a better stability of devices in air. These findings testify the importance and potential of semiconductor QD modification on ETLs, which may pave the way for developing such composite ETLs for further enhancing photovoltaic performance of planar PSCs.
中文翻译：
具有出色电导率和适用于能带排列的高性能平面型钙钛矿太阳能电池的CdS稀释量子点辅助SnO 2电子传输层
具有出色导电性和合适的能带排列的电子传输层（ETL）在加速电荷提取和转移以实现高效平面钙钛矿太阳能电池（PSC）方面起着关键作用。在本文中，已经通过低温制造工艺开发了新型的稀释的硫化镉量子点（CdS QD）辅助的SnO 2 ETL。少量添加CdS QD首先会增强SnO 2 ETL的结晶度和平坦度，因此它为获得高质量钙钛矿吸收层提供了一个有前途的工作站。它还惊人地将SnO 2 ETL的电导率提高了一个数量级，并调节了SnO 2之间的能级匹配ETL和钙钛矿。这些出色的性能极大地加快了电荷的提取和转移。因此，具有这种稀释的CdSQD辅助SnO 2 ETL的基于MAPbI 3的PSC达到20.78％的最大功率转换效率，并在空气中获得更好的器件稳定性。这些发现证明了在ETL上进行半导体QD修饰的重要性和潜力，这可能为开发这种复合ETL从而进一步提高平面PSC的光伏性能铺平了道路。
更新日期：2021-04-14
中文翻译：
具有出色电导率和适用于能带排列的高性能平面型钙钛矿太阳能电池的CdS稀释量子点辅助SnO 2电子传输层
具有出色导电性和合适的能带排列的电子传输层（ETL）在加速电荷提取和转移以实现高效平面钙钛矿太阳能电池（PSC）方面起着关键作用。在本文中，已经通过低温制造工艺开发了新型的稀释的硫化镉量子点（CdS QD）辅助的SnO 2 ETL。少量添加CdS QD首先会增强SnO 2 ETL的结晶度和平坦度，因此它为获得高质量钙钛矿吸收层提供了一个有前途的工作站。它还惊人地将SnO 2 ETL的电导率提高了一个数量级，并调节了SnO 2之间的能级匹配ETL和钙钛矿。这些出色的性能极大地加快了电荷的提取和转移。因此，具有这种稀释的CdSQD辅助SnO 2 ETL的基于MAPbI 3的PSC达到20.78％的最大功率转换效率，并在空气中获得更好的器件稳定性。这些发现证明了在ETL上进行半导体QD修饰的重要性和潜力，这可能为开发这种复合ETL从而进一步提高平面PSC的光伏性能铺平了道路。
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