Development of High Efficiency Perovskite Solar Module and High Sensitive X-ray Detector by Non-Vacuum Solid State Reaction Process

The main objective of this project is to develop a high quality, structure controllable perovskite materials by non-vacuum solid-solid reaction process (SSR) for the high efficiency perovskite photovoltaic modules and the direct conversion X-ray flat panel detectors (DCXFPD) and related processing technologies. The goals are to enlarge the single crystal boundary size and to control the crystal direction by two-step SSR method with printing process. A comprehensive investigation of the perovskite materials and modules need to be carried out. The three year objectives are listed below. First year: Fabricate the PbI2 and PbO film by screen printing or wet coating method with non-toxic solvents and study the crystal morphology, direction and size of CH3NH3PbI3 and CH3NH3PbBr3 film by SSR process. To understanding the growth mechanism of CH3NH3PbI3 and CH3NH3PbBr3 film is the goal of first year. The two-dimensional crystal and vertical single crystal boundary of CH3NH3PbI3 and CH3NH3PbBr3 film and apply to photovoltaic device will also be investigated. Second year: We will focus on the control of microstructure and surface modification of TiO2 electrode in the photovoltaic device. The goal is to reduce the capacitive effect and to balance the transportation of internal electron-hole in the device interface after fabricating the perovskite films by SSR method, and finally to reduce the I-V hysteresis of device. On the other hand, the large mobility and carrier lifetime of perovskite single crystals and the high atomic numbers of Pb, I and Br make them ideal for X-ray detection. We fabricated the perovskite photoconductor, utilizing the SSR technique. The components and fabrication parameters in the process were optimized to form a thick perovskite layer which achieved high sensitivity, high contrast and high conversion efficiency. Third year: Extending the results of the first two years, to enlarge the area and control the crystal of perovskite film by SSR method on the photovoltaic module (25 cm2 ~ 100 cm2) and large area DCXFPD applications. We will optimize the perovskite photovoltaic module performance to conversion efficiency of 15% by integrating with the novel module patterns, electrode materials and sealing process in the project. EIS, LBIC and TRPL experiments will also be carried out to understand the fundamental characteristics, so that we can get the best possible photovoltaic performance. On the other hand, large area single-crystal perovskite film with a thickness of 100-200m will be fabricated on patterned substrate and shows high detection efficiency at near zero bias under irradiation of continuum X-ray energy. The lowest detectable X-ray dose rate with a high sensitivity, which will higher than the sensitivity achieved with α-Se X-ray detectors. This allows the radiation dose applied to a human body to be reduced for many medical and security check applications.

Project ID:PB10605-0085
External Project ID:MOST106-2218-E182-005-MY2