Numerical modeling and performance enhancement of carbon-based monolithic perovskite solar cell using cesium-based triple cation composition
Hafiz Faizan Ahmad a, Zubair Ahmad b
a Department of Physics and Electronics, University of Peshawar, 25120, KPK, Pakistan
b Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Oral, Hafiz Faizan Ahmad, presentation 021
Publication date: 15th November 2022


The outstanding optoelectronic properties of organic-inorganic perovskites have skyrocketed the efficiency values in perovskite solar cells (PSCs) from 3.8% to 25.5%. Currently, the methylammonium (MA) and formamidinium (FA) as single cations exhibit various drawbacks, including thermal degradation and structural instability. With the addition of inorganic cesium (Cs) cation, the resulting triple cation perovskite compositions are thermally more stable, contain fewer phase impurities, and are less sensitive to processing conditions. In addition, carbon-based monolithic perovskite solar cells (m-PSCs) are multi-layered organic-inorganic hybrid cells that offer device simplicity, cost-effectiveness, and improved stability. Even though the mPSCs can be prepared using the printing process, their lower efficiency (<18%) is leftover as a primary challenge. In addition, understanding of device operation and other (electrical and physical) parameters of Csx(FA0.4MA0.6)1-xPbI2.8Br0.2 based on a reasonable device model are inadequate. Hence, it's vital to understand the physical processes inside the mPSCs. This study aims to simulate m-PSC, find the absorber layer's optimum parameters, and improve their performance further. To investigate this, we performed a systematic simulation-based survey on the optimized mPSC with a power conversion efficiency of over 13% using solar cell capacitance simulator (SCAPS) software. Our device structure employs FTO, TiO2, the absorber layer, and carbon electrode. Initially, we compared our simulated model with experimentally reported values to validate our parameters. Then, we optimized various parameters of the absorber layer, including the thickness, doping concentration, defect density, and interface defect density, and enhanced the efficiency from 13.3% to over 20%. Here, by optimizing different electrical and physical parameters of the absorber layer, we show over 20% PCE is attainable in practice. This work paves the way toward cost-effective, efficient, and stable carbon-based HTL-free PSCs. The findings are helpful for understanding device operation and provide enough valuable information for the possible advancement in the performance of m-PSC using Csx(FA0.4MA0.6)1-xPbI2.8Br0.2 as a perovskite absorber.


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