钝化
硫化铅
材料科学
开路电压
光伏系统
光致发光
量子点
量子产额
太阳能电池
光电子学
纳米技术
能量转换效率
电压
光学
电气工程
物理
工程类
荧光
图层(电子)
作者
Yang Liu,Hao Wu,Guozheng Shi,Yusheng Li,Yiyuan Gao,Shiwen Fang,Haodong Tang,Wei Chen,Tianshu Ma,IA Khan,Kai Wang,Changlei Wang,Xiaofeng Li,Qing Shen,Zeke Liu,Wanli Ma
标识
DOI:10.1002/adma.202207293
摘要
The high open-circuit voltage (Voc ) loss arising from insufficient surface passivation is the main factor that limits the efficiency of current lead sulfide colloidal quantum dots (PbS CQDs) solar cell. Here, synergistic passivation is performed in the direct synthesis of conductive PbS CQD inks by introducing multifunctional ligands to well coordinate the complicated CQDs surface with the thermodynamically optimal configuration. The improved passivation effect is intactly delivered to the final photovoltaic device, leading to an order lower surface trap density and beneficial doping behavior compared to the control sample. The obtained CQD inks show the highest photoluminescence quantum yield (PLQY) of 24% for all photovoltaic PbS CQD inks, which is more than twice the reported average PLQY value of ≈10%. As a result, a high Voc of 0.71 V and power conversion efficiency (PCE) of 13.3% is achieved, which results in the lowest Voc loss (0.35 eV) for the reported PbS CQD solar cells with PCE >10%, comparable to that of perovskite solar cells. This work provides valuable insights into the future CQDs passivation strategies and also demonstrates the great potential for the direct-synthesis protocol of PbS CQDs.
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