Development of Large-Area, High-Efficiency and Stable Perovskite Photovoltaic Cells and Modules Fabricated under Atmospheric Environment

The main objective of this project is to develop a large scale, high quality and crystal structure controllable perovskite layer by thermal-controlled blade coating for the high efficiency perovskite photovoltaic modules and related processing technologies. The goals are to enlarge the single crystal boundary size and preferred orientation of perovskite film. A comprehensive investigation of the optimum structure and crystalline state of perovskite materials and photovoltaic modules need to be carried out. The three year objectives are listed below. First year: Fabricate the large CH3NH3PbI3 film by thermal-controlled blade coating deposition process and study the crystal morphology, direction and size of CH3NH3PbI3 by selection of solvents and substrate temperatures. Understanding the growth mechanism and marangoni effect of CH3NH3PbI3 film is the first goal of first year. Investigating of microstructure and surface modification of compact TiO2 and mesoporous TiO2 electrode, respectively, and preparation of high-efficiency perovskite solar cells by combining optimized TiO2 layer and perovskite layer. Second year: We will focus on the control of defect in perovskite photovoltaic device. Controlling the concentration of KI and I2 and exploring the effect of I-/I3- concentration and ratio in perovskite solution on the deep defect reduction after perovskite film formation. The goal is to reduce the defects and interface capacitive effect and to balance the transportation of internal electron-hole in the device interface after preparing the perovskite films by thermal-controlled blade coating method, and to reduce the J-V hysteresis of perovskite solar cell and modules. The effect of two-dimensional perovskites in three-dimensional perovskites phase, surface passivation and vertical single crystal boundary of CH3NH3PbI3 film on application of photovoltaic device will be investigated. Third year: Extending the results of the first two years, to replay the additives of hole transport material (HTM) by RT-ionic liquids and to enlarge the coating area and control the crystal of perovskite film on the photovoltaic module (25 cm2 to 100 cm2). We will optimize the perovskite photovoltaic module design and improve the device performance to a conversion efficiency of more than 18% by integrating with the novel module patterns, electrode materials and sealing process in the project. Further explore the P1P2P3 process and analysis the module by EIS, LBIC and TRPL will also be carried out to understand the fundamental characteristics, so that we can get the best possible photovoltaic performance. The stability of perovskite solar module at different test conditions will also be investigated in this project.

Project ID:PB10901-3135
External Project ID:MOST108-2628-E182-003-MY3