What is it about?
Spiro-OMeTAD, a hole transport material (HTM), has garnered significant attention in perovskite solar cells (PSCs) research for enhancing the efficiency and stability of methylammonium lead iodide (CH3NH3PbI3) devices. However, perovskite lead contains material that faces challenges such as thermal instability, lead toxicity, limited power conversion efficiency, and obstacles to the commercialization of PSC devices. In this work, we numerically optimized an inverted device structure (Spiro-OMeTAD/methylammonium lead iodide/PCBM/ZnO/ ITO) using the solar cell simulation tool via Solar Cell Capacitance Simulator (SCAPS). Here, the Spiro-OMeTAD Material functions as the hole transport layer, while the PCBM and zinc oxide (ZnO) form the electron transport bilayer, with the Indium tin oxide (ITO) serving as the transparent conductive electrode. By carefully adjusting the thickness of the buffer layer, charge carrier concentration, and parasitic resistance at varying operating temperatures, we achieved an optimized device that offers an efficiency (PCE) of 22.57 %, an open circuit voltage (VOC) of 1.0838 V, a fill factor (FF) of 82.72 %, and a short circuit current density (JSC) of 25.174476 mA/cm2 . These simulation results will assist in fabricating a perovskite device via Spiro-OMeTAD as the buffer layer to reduce the perovskite grain size. Metallic dopants promote the formation of oxidized radical cations. The buffer layer improves hole mobility, conductivity, and overall device stability by protecting against environmental Spiro-OMeTAD, a hole transport material (HTM), has gained significant attention in perovskite solar cell (PSC) research for enhancing the efficiency and stability of methylammonium lead iodide (CH3NH3PbI3) devices. However, perovskite lead-based materials face challenges such as thermal instability, lead toxicity, limited power conversion efficiency, and obstacles to the commercialization of PSC devices. In this study, we numerically optimized an inverted device structure (Spiro-OMeTAD/methylammonium lead iodide/PCBM/ZnO/ITO) using the Solar Cell Capacitance Simulator (SCAPS) software. In this configuration, Spiro-OMeTAD acts as the hole transport layer, while PCBM and zinc oxide (ZnO) form the electron transport bilayer, with indium tin oxide (ITO) serving as the transparent conductive electrode. By carefully adjusting the thickness of the buffer layer, charge carrier concentration, and parasitic resistance at varying operating temperatures, we achieved an optimized device that offers a power conversion efficiency (PCE) of 22.57%, an open-circuit voltage (VOC) of 1.0838 V, a fill factor (FF) of 82.72%, and a short-circuit current density (JSC) of 25.17 mA/cm². These simulation results will assist in fabricating a perovskite device with Spiro-OMeTAD as the buffer layer to reduce the perovskite grain size. Additionally, metallic dopants promote the formation of oxidized radical cations, while the buffer layer enhances hole mobility, conductivity, and overall device stability by protecting against environmental degradation.
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Why is it important?
To optimize the spiro-OMeTAD as HTL of the buffer layer for an inverted device structure (Spiro-OMeTAD/CH₃NH₃PbI₃ /PCBM/ZnO/ITO) using SCAPS-1D. To investigate the effects of key parameters such as Spiro-OMeTAD thickness, carrier concentration, parasitic resistance, and operating temperature on device efficiency and stability, using SCAPS-1D numerical simulations. To assist in fabricating a perovskite device via Spiro-OMeTAD as the buffer layer to reduce the perovskite grain size. To predict the performance of an existing or planned system and to compare alternative solutions for a particular design problem. To fill the equery knowledge and execution to enable experimentation
Perspectives
Our study uniquely explores an inverted device structure (Spiro-OMeTAD/methylammonium lead iodide/PCBM/ZnO/ITO) and employs a systematic optimization approach to identify the ideal combination of parameters. Specifically, we optimized: Buffer layer thickness (40 nm), Carrier concentration (NA=1.0×1022cm−3 ), Operating temperature (300 K), Parasitic resistances (RS= 0 Ω·cm2, RSh=5×104 Ω·cm2). This comprehensive optimization resulted in a device efficiency of 22.57 %, which is competitive for inverted Spiro-OMeTAD-based PSCs. Importantly, our study also emphasizes stability by minimizing environmental degradation, a critical challenge in PSC research. By carefully controlling extrinsic factors and optimizing key parameters, we demonstrate the potential of simulation-based approaches to guide experimental fabrication and improve both efficiency and durability.
Anteneh Yesigat Walelgn
KUE, Ethiopia
Read the Original
This page is a summary of: Optimization of spiro–OMeTAD as the buffer layer for CH3NH3PbI3 perovskite solar cells using SCAPS, Journal of Physics and Chemistry of Solids, February 2026, Elsevier,
DOI: 10.1016/j.jpcs.2025.113250.
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