Journal
ACS ENERGY LETTERS
Volume 2, Issue 10, Pages 2319-2325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00751
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Funding
- Australian Government through the Australian Renewable Energy Agency (ARENA)
- Australian Government via an Australian Postgraduate Award scholarship
- UNSW via an Engineering Research Award
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Cesium (Cs) metal halide perovskites for photovoltaics have gained research interest due to their better thermal stability compared to their organic inorganic counterparts. However, demonstration of highly efficient Cs-based perovskite solar cells requires high annealing temperature, which limits their use in multijunction devices. In this work, low-temperature processed cesium lead (Pb) halide perovskite solar cells are demonstrated. We have also successfully incorporated the less toxic strontium (Sr) at a low concentration that partially substitutes Pb in CsPb1-xSrxI2Br. The crystallinity, morphology, absorption, photoluminescence, and elemental composition of this low-temperature-processed CsPb1-xSrxI2Br are studied. It is found that the surface of the perovskite film is enriched with Sr, providing a passivating effect. At the optimal concentration (x = 0.02), a mesoscopic perovskite solar cell using CsPb0.98Sr0.0I2Br achieves a stabilized efficiency at 10.8%. This work shows the potential of inorganic perovskite, stimulating further development of this material.
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