期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 24, 页码 27307-27315出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c07667
关键词
CsPbBr3 quantum dots; perovskite solar cell; surface ligands; semitransparent; high open-circuit voltage; stability
资金
- National Key Research Projects [2016YFA0202402]
- National Natural Science Foundation of China [51761145013, 61911530158, 51803144, 61674111]
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- China Postdoctoral Science Foundation [2019M651942]
- 111 project
As effective light absorbers in solar cells, CsPbI3 all-inorganic perovskite quantum dots (QDs) have received increasing attention, benefitting from their suitable optical band gap and thermal stability. However, the easy cubic to yellow orthorhombic phase transition hinders their further application in stable photovoltaic devices. CsPbBr3 QDs have been targeted as a promising material for ultrahigh voltage and stable solar cells. In this work, we first develop a simple yet efficient post-treatment method using guanidinium thiocyanate (GASCN), which is able to exchange the native capping ligands of CsPbBr3 QDs, thus improving the carrier transport properties through enhanced electrical coupling between QDs. Additionally, the morphology and crystalline properties of solid QD films are also improved. Therefore, simultaneously improved open-circuit voltage (V-oc), short-circuit current density (J(sc)), and fill factor (FF) were obtained in the corresponding CsPbBr3 QD devices. Finally, the QD solar cells based on optimal hole-transporting layers delivered the highest efficiency exceeding 5% together with an ultrahigh V-oc of 1.65 V, representing the most efficient CsPbBr3 QD solar cells to date. More importantly, the CsPbBr3 perovskite QD solar cells developed here exhibit excellent stability, ultrahigh voltage, and high transparency over the entire visible spectrum region, demonstrating their great potential in applications like solar windows of greenhouse and hydrogen generation driven by perovskite solar cells.
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