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Simulated development and optimized performance of CsPbI3 based all-inorganic perovskite solar cells
摘要： Cesium lead iodide (CsPbI3), as one promising inorganic halide perovskite for higher stability, has received extensive attention in recent years. However, CsPbI3 based perovskite solar cells (PSCs) have yet to realize the high e?ciency achieved in organic-inorganic hybrid PSCs. In this work, we perform a device modeling by SCAPS-1D to investigate the limitation of CsPbI3 all-inorganic PSC (CsPbI3 i-PSCs) and improve its performance. For i-PSC, not only the absorber but all the layers should be composed of inorganic materials only. Therefore, several potential inorganic hole and electron transport layers (i-HTL and i-ETL) are compared ?rstly and the results reveal that Cu2O HTL and SnO2 ETL are the most suitable materials among them. Moreover, the device performance is further improved by optimizing the work function of back electrode, absorber thickness, doping density as well as defect density. Under optimized conditions, a conversion e?ciency of 21.31% is obtained for the FTO/SnO2/CsPbI3/Cu2O/Au i-PSC, indicating that there is much room for further performance enhancement.
关键词： CsPbI3,Device modeling,All-inorganic perovskite solar cell
更新于2025-09-23 15:19:57
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CoCl2 as film morphology controller for efficient planar CsPbIBr2 perovskite solar cells
摘要： High quality perovskite (PVK) film is quite important to reduce the energy loss (Eloss) and enhance the performance of planar CsPbIBr2 PVK solar cells (PSCs). In this work, 5% PbBr2 is substituted by CoCl2 in inorganic CsPbIBr2 PVK, acting as film morphology controller to slow down the crystallization process. It results in a dense and flat pinhole-free CsI(PbBr2)0.95(CoCl2)0.05 PVK film. Therefore, the trap state density is greatly reduced, which lead to reduce non-radiative recombination of carriers and Eloss, therefore, the open-circuit voltage (Voc) of the device is increased from 1.14V of control sample to 1.25V. The optimal photoelectric conversion efficiency (PCE) is enhanced to 10.43% relative to 6.93% of CsPbIBr2 PSCs. More importantly, the air stability of CsI(PbBr2)0.95(CoCl2)0.05 PSCs is greatly enhanced, which still maintain above 90% in the air of 25(cid:1) and RH=20% for 25 days without encapsulation. This work highlights the great effect of CoCl2 as a morphology controller on improving CsPbIBr2 film quality and device performance.
关键词： energy loss,inorganic perovskite solar cell,crystalline growth,charge transport,film quality
更新于2025-09-23 15:19:57
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10.34%-efficient integrated CsPbBr3/bulk-heterojunction solar cells
摘要： Inorganic cesium lead bromide (CsPbBr3) perovskite solar cells (PSCs) have superior moisture- and thermal-stability in comparison with organic-specie or/and I-containing devices. However, the narrow-spectra absorption (<550 nm) arising from their large bandgap of 2.3 eV for CsPbBr3 halide has markedly limited the further efficiency enhancement of corresponding inorganic device, therefore a great challenge is to broaden the light response range without sacrificing environmental tolerances. In this work, we constructively fabricate a CsPbBr3/bulk-heterojunction (organic J61-ITIC) photoactive layer to widen the optical absorption range of inorganic CsPbBr3 based interlayer-free device. Arising from the broadened light response wavelength from 550 to 780 nm and precisely optimized crystal lattice by incorporating Rb into CsPbBr3 film, the optimal device achieves a power conversion efficiency up to 10.34% under one sun illumination. Upon persistent attacks by heat of 80°C (0% humidity) or 90% humidity (25°C) over 40 days, the solar cell can still remain approximately 96% of initial efficiency, demonstrating the excellent stability for practical application.
关键词： Inorganic perovskite solar cell,Wide-spectral absorption,Cesium lead bromide,Photoactive layer,Improved stability
更新于2025-09-19 17:13:59
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Precise stress control of inorganic perovskite films for carbon-based solar cells with an ultrahigh voltage of 1.622?V
摘要： All-inorganic cesium lead bromide (CsPbBr3) perovskite solar cell is one promising candidate to balance high efficiency and poor stability of organic-inorganic hybrid photovoltaics. The charge carrier transport can be maximized for high-efficiency devices through precise stress control during perovskite grain growth process to obtain high-quality full-bromine CsPbBr3 halide films. We present here the monolayer-aligned and large-grained CsPbBr3 perovskite films through precise control of crystallization temperature of PbBr2 film because the lattice volume is enlarged by 2.18 times during the phase conversion from PbBr2 to CsPbBr3, which helps to minimize residual-stress-induced grain boundaries and defect-induced charge recombination. Upon further interfacial modification by nitrogen doped carbon quantum dots, the hole transporting materials free, all-inorganic CsPbBr3 perovskite solar cell achieves a champion efficiency as high as 10.71% with an ultrahigh open-circuit voltage of 1.622 V. Moreover, the unencapsulated solar cell demonstrates remarkable long-term stability in 85% humidity in air atmosphere.
关键词： Stability,Strain engineering,Crystal growth,Cesium lead bromide,Charge recombination,Inorganic perovskite solar cell
更新于2025-09-12 10:27:22
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Acetate based Crystallization Kinetics Modulation of CsPbI2Br for Improved Photovoltaic Performance
摘要： Inorganic CsPbI2Br perovskite has emerged to be a promising candidate for photovoltaic materials, while developing additives engineering strategies to address the issues of defects induced crystalline phase transformation from photoactive perovskite phase to non-perovskite phase has been a challenge to achieve their outstanding optoelectronic properties and thermal stability. In this work, we demonstrate an effective acetate mediation strategy for significantly retarding the crystallization process and thus the phase transformation, which leads to much improved optoelectronic performance of the solar cells. It was demonstrated that the addition of acetate like Cobalt(II) acetate (Co(Ac)2) or zinc acetate (Zn(Ac)2) could lead to significantly retarded crystallization process of perovskite films, as well as the formation of the flat, dense and defect-less perovskite film. We propose that the perovskite crystal grows up following the ostwald ripening mechanism at 270 ℃ annealing temperature, during which the acetate in the perovskite film would be squeezed from boundaries by grains growing cause the acetate cannot through the crystalline. Based on the proposed strategy of crystallization kinetics modulation with acetate, the photon conversion efficiency (PCE) of champion device with that acetate modified perovskite film can reach as high as 15.04%, and superb fill factor of 80.46%. We thus believe that our work could provide an effective alternative for the designing of high performance inorganic CsPbI2Br perovskite solar cells.
关键词： Acetate,CsPbI2Br,All-inorganic perovskite solar cell,Photo-conversion efficiency,Crystallization kinetics
更新于2025-09-12 10:27:22