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All-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3-xBrx Mixed-dimensional Perovskite Solar Cells with Enhanced Efficiency and Stability
摘要： The inorganic halide perovskite CsPbI3 has shown great promise in efficient solar cells. However, the α-phase CsPbI3 is thermodynamically unstable at room temperature, limiting its applications. Herein, we have successfully fabricated highly stable all-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3-xBrx mixed-dimensional perovskite solar cells. The 0D Cs4Pb(IBr)6 phase spontaneously distributes in the 3D CsPbI3-xBrx perovskite phase and facilitates the (100) preferential crystal orientation of the CsPbI3-xBrx crystals. Due to the reasonable energy level alignment and lattice match between (040) in 0D Cs4Pb(IBr)6 and (002) in 3D CsPbI3-xBrx crystals, a 0D-3D heterojunction structure formed. The defect passivation and non-radiative recombination suppression within the films effectively promote smooth carrier transport in the perovskite solar cells, boosting the efficiency to 14.77%. The devices retained 93.9% of the initial efficiency after 60 days in a nitrogen atmosphere. Moreover, a high efficiency of 10.52% has also been achieved in the 1 cm2-large solar cells due to the high uniformity and repeatability of the 0D/3D films.
关键词： Cs4Pb(IBr)6,heterojunction,CsPbI3-xBrx,all-inorganic perovskite solar cells,stability
更新于2025-09-23 15:21:01
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2Da??3D Cs <sub/>2</sub> PbI <sub/>2</sub> Cl <sub/>2</sub> a??CsPbI <sub/>2.5</sub> Br <sub/>0.5</sub> Mixed-Dimensional Films for All-Inorganic Perovskite Solar Cells with Enhanced Efficiency and Stability
摘要： The phase instability of cesium lead halide perovskite is still a substantial challenge hindering its application. A 2D-3D all-inorganic Cs2PbI2Cl2-CsPbI2.5Br0.5 perovskite solar cell was successfully developed to address this issue. The 2D Cs2PbI2Cl2 phase distributed among the grain boundaries of the 3D CsPbI3-xBrx grains. The existence of Cs2PbI2Cl2 effectively facilitated the (100) preferential crystal orientation of the CsPbI2.5Br0.5 crystals, promoting the carrier transport. The smooth transition region between the (003)2D//(001)3D interface indicated the formation of a 2D-3D heterostructure. Due to the improved crystal quality, high uniformity and repeatability, the efficiency of the solar cells with areas of 0.09 cm2, 1 cm2 and 2 cm2 significantly improved to 15.09%, 12.74%, and 10.01%, respectively. The PCE retained 95.3% of the initial efficiency after 60 days in a nitrogen atmosphere at room temperature and 80% of the initial efficiency at humidity of 70±10% RH under continuous heating at 80°C for 12 h.
关键词： heterojunction,CsPbI3-xBrx,Cs2PbI2Cl2,all-inorganic perovskite solar cells,stability
更新于2025-09-23 15:21:01
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Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance
摘要： All inorganic CsPbI3-xBrx perovskites have been widely used in photodetectors due to their excellent optoelectronic properties and simple preparation processes. Here, high-performance flexible photodetectors based on inorganic CsPbI3-xBrx perovskites are demonstrated, which are achieved by a modified solution-processed method. When biased at a low voltage of 10 mV, the device yielded fast response speeds (90 μs /110 μs for CsPbI2Br PDs and 100 μs/140 μs for CsPbIBr2 PDs), a high on/off ratio of 104, and a high detectivity about 1012 Jones. Meanwhile, the devices showed outstanding environmental stability and mechanical flexibility. The periodic I-t curves had negligible fluctuation (< 5%) after storing in air atmosphere for 30 days or bending for 100 times. The results indicate that CsPbI3-xBrx perovskites have great potential in photodetection areas and pave the way to achieve high-performance flexible PDs.
关键词： Mechanical flexibility,Environmental stability,Low bias voltage,CsPbI3-xBrx-based flexible PDs
更新于2025-09-11 14:15:04