Efficiency Improvement of Perovskite Solar Cells by Utilizing CuInS₂ Thin Layer: Modeling and Numerical Study
R. RafieiRad, Bahram Azizollah Ganji
Abstract
Perovskite-based devices are a promising candidate for the next generation of photovoltaic devices. Depending on the selective contacts layers and their interfaces with the absorber, the performance and photoelectric parameters of the perovskite solar cells (PSCs) can be changed. So, it is possible, to achieve highly efficient and stable PSCs by engineering the selective contacts layers and their interface with the perovskite layer. In this study, inorganic CuInS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (CIS) was inserted between the perovskite and Spiro–OMeTAD for decreasing charge recombination at the interfaces. The impact of the CIS and Spiro–OMeTAD on the solar cell photoelectrical parameters is theoretically modeled, and the performance of the solar cells was examined with Solar Cell Capacitance Simulator (SCAPS-1D) under AM1.5G spectrum at 300 K. Results show utilizing a thin layer of CIS can improve the performance of the solar cell. Photovoltaic characterization of the solar cell with CIS shows 18.13%, 73.34%, 1.09 V, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$22.69\,\,{\mathrm {mA}}\,\cdot \, {\mathrm {cm}}^{-2}$ </tex-math></inline-formula> , respectively, for efficiency, fill factor (FF), <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${V}_{{\mathrm {oc}}}$ </tex-math></inline-formula> , and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${J}_{{\mathrm {sc}}}$ </tex-math></inline-formula> . These results indicated a 7% improvement in efficiency increased and 2% on FF increased compared with the structure without CIS. High-mobility CIS can extract more carriers. It is believed this study can provide guidelines for the design and production of economic and stable PSCs with further efficiency enhancement.