Micro structurally engineered hysteresis-free high efficiency perovskite solar cell using Zr-doped TiO2 electron transport layer. Issue 10 (15th May 2021)

• Record Type: Journal Article
• Authors: Sandhu, Sanjay; Saharan, Chirag; Buruga, Susan Kumari; Kumar, S. Arun; Rana, Pawan S.; Nagajyothi, P.C.; Mane, Suresh D.
• Is Part Of: Ceramics international. Volume 47:Issue 10(2021)Part A
• Page Start: 14665
• Page End: 14672
• Publication Date: 2021-05-15
• Subjects: Hybrid perovskite solar cells -- Zr-doping -- Band alignment -- Trap-state density -- Non-geminated recombination losses; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.01.187
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The high trap-state density and low conductivity in compact TiO2 (c-TiO2 ) layer limits the power conversion efficiency (PCE) of organic-inorganic hybrid perovskite solar cells (HPSCs). Metal doping in c-TiO2 has been proven to be a successful strategy for enhancing the PCE of HPSCs. Herein, Zr is incorporated in the c-TiO2 layer with different doping concentrations, and its impact on the photovoltaic performance of methylammonium lead iodide (MAPbI3 ) HPSCs is investigated. Inclusion of Zr enhances the charge carrier collection at TiO2 /perovskite junction as well as conductivity of TiO2 layer. It is demonstrated that Zr-doping reduces the dark current significantly by suppressing non-geminated recombinations, leakage path, and electron trap-states. As a result, the HPSCs with optimum Zr-doping (10 vol%) exhibits open-circuit voltage ( V OC ) of 1.076 V, short-circuit current density ( J SC ) of 23.57 mA cm −2, and PCE of 18.16% under one-sun illumination conditions. UV absorption confirms the increase in bandgap upon Zr-doping that leads to favorable band alignment with the perovskite layer. Further, the engineered solar cells are probed for current density-voltage ( J - V ) hysteresis, operational stability, leakage current, intensity-dependence behavior, and electrochemical impedance spectroscopy (EIS).