Tuning Excitonic Properties of Pure and Mixed Halide Perovskite Thin Films via Interfacial Engineering

• DOI: 10.1002/admi.201800209
• Publication Date: 2018-06-08T05:40:56Z
• Authors: Katerina Nikolaidou; Som Sarang; Denzal Martin; Vincent Tung; Jennifer Q. Lu; Sayantani Ghosh
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract The authors explore the potential of ZnO layers different morphologies, including single crystalline, micro‐structured, and nano‐structured substrates, for tuning exciton binding energy influencing charge extraction when interfaced with pure (CH 3 NH PbI ) mixed 3− x Cl halide hybrid perovskite (PVSK) thin films. Electron microscopy characterization PVSK/ZnO interfaces are correlated transfer properties, probed by means temperature, power, time‐resolved photoluminescence (PL) spectroscopy. results show that at room crystalline film promotes PL quenching, reduces recombination lifetime along density in PVSK films, all indicative efficient electron extraction. Nevertheless, micro‐structured exhibit a mild increase enhances up to several thousand‐fold, while simultaneously enhancing rates 50%. These trends temperature dependent, findings highlight two opposing aspects how excitonic dissociation films is affected morphology underlying layers. While can be leveraged as an layer application photovoltaic devices, micro‐ ones offer new opportunities utilization high quantum yield perovskites opto‐electronic platforms.