期刊
ECOMAT
卷 4, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/eom2.12192
关键词
all-inorganic; energy level; oxygen vacancy; perovskite solar cells; ZnO
类别
资金
- CUHK PIEF [3133288]
- Research Grant Council of Hong Kong (RGC) General Research Fund [14305721]
- CRIMS Grant [3133288]
In this work, low-temperature processed ZnO doped with PbX2 is used as an ETL alternative to improve the stability and performance of cesium lead based all-inorganic perovskite solar cells. The incorporation of PbX2 enhances the energy level alignment and promotes the growth of the perovskite layer, leading to enhanced charge extraction and suppression of charge recombination. As a result, the efficiency of the PSCs is significantly improved.
Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the V-OC. In this work, we developed low-temperature processed ZnO as an ETL alternative. Incorporation of PbX2 (X = I-, Cl-, and CH3COO-) was found to increase oxygen vacancies in ZnO, which not only promoted the growth of all-inorganic perovskite layer with improved morphology and orientational order, but also formed a favorable energy level alignment with the perovskite layer, thus facilitating charge extraction and suppressing charge recombination. Consequently, the CsPb(I1-xBrx)(3) PSCs based on PbX2:ZnO exhibited enhanced stability and performance. The efficiency was boosted from 17.64% to 20.04% with an improved fill factor of 84.14% and a V-OC of 1.28 V, being the highest V-OC among highly efficient (>20%) all-inorganic PSCs to date.
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