Photoelectrical Dynamics Uplift in Perovskite Solar Cells by Atoms Thick 2D TiS2 Layer Passivation of TiO2 Nanograss Electron Transport Layer

• DOI: 10.1021/acsami.0c20137
• Publication Date: 2021-01-10T08:29:44Z
• Authors: Nabilah Alias; Akrajas Ali Umar; Nurul Ain Abd Malek; Kai Liu; Xiaoguo Li; Nur Adliha Abdullah; Mohd Mustaqim Rosli; Mohd Yusri Abd Ra...; Zejiao Shi; Xin Zhang; Haijuan Zhang; Fengcai Liu; Jiao Wang; Yiqiang Zhan
• Keywords: Passivation; Electron Mobility; Quantum Efficiency; Perovskite solar cell; Open-circuit voltage

A deficiency in the photoelectrical dynamics at interface due to surface traps of TiO2 electron transport layer (ETL) has been critical factor for inferiority power conversion efficiency (PCE) perovskite solar cells. Despite its excellent energy level alignment with most materials, large density defect as a result sub lattice vacancies hurdle an efficient photovoltaic process device. Here, we report that atoms thick 2D TiS2 grown on (001) faceted and single-crystalline nanograss (NG) ETL have effectively passivated defects, boosting charge extractability, carrier mobility, external quantum efficiency, device stability. These properties allow cells (PSCs) produce PCE high 18.73% short-circuit current (Jsc), open-circuit voltage (Voc), fill-factor (FF) values 22.04 mA/cm2, 1.13 V, 0.752, respectively, 3.3% improvement from pristine TiO2-NG-based PSCs. The present approach should find extensive application controlling dynamic