Use of microfabricated platforms by lithography to obtain perovskite structures of CH3NH3PbI3

• Grant number: 17/18051-1
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): November 01, 2017
• Effective date (End): October 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal Investigator: Lucia Helena Mascaro Sales
• Grantee: Nicolas Caetano da Silva Braghini
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

In this project the performance of perovskites of the type CH3NH3PbI3 on microfabricated platforms by photolithography (MPPh) will be evaluated. The MPPh will be obtained using a layer of positive photoresist deposited on substrate, a metallic mask and ultraviolet radiation. The design of the platforms will allow obtaining microcolumns of CuI, which will be used as a hole transport materials. Furthermore, a compact layer of TiO2 will be used as a electron transport materials, as well as a mesoporous layer of TiO2, which will be deposited for methilammonium lead iodide perovskite infiltration. The materials of the devices (TiO2, CH3NH3PbI3 and CuI) will be deposited between the microcolumns of CuI by spin coating following the sequence of a compact layer of TiO2, a mesoporous layer of TiO2, CH3NH3PbI3 and a compact layer of CuI. After the growth of CuI microcolumns surrounded by the perovskite layer, it is expected that these microcolumns will behave as more efficient hole conductors. Moreover, the CuI microcolumn diameter and its thickness will be optimized by means of the power conversion efficiency of the devices, which will be characterized with microscopic techniques, current-voltage characteristics, diffuse reflectance spectroscopy, X-ray diffraction and Energy-dispersive X-ray spectroscopy. (AU)