Hillhouse, Hugh WQiao, Hongbo2020-04-302020-04-302020-04-302020Qiao_washington_0250O_21252.pdfhttp://hdl.handle.net/1773/45517Thesis (Master's)--University of Washington, 2020The hybrid perovskite is an emerging material for photovoltaic application that reached 25.2% efficiency up to date. Intensive researches have focused on this area. Recently, understanding various degradation mechanism for HPs is catching more attention among researchers. In this work, we used a state of art technology to simultaneously measure the diffusion length, transmissivity, and photoluminescence intensity and take PL video. By combining the degradation results on spin coated CsPbI3 and MAPbI3 films, and spray coated MAPbI3 film with a python simulation, we find a strong agreement that the MAPbI3 degradation follows the mass loss mechanism. And we proposed a very detailed PL-PC-Tr experiments on spin cast MAPbI3 films. With different levels of relative humidity, excitation intensity, temperature and gas environment, we reveled the influence of different environmental factors on degradation process. It is shown that temperature combined with oxygen percentage is a dominant factor in the degradation process for MAPbI3. We also find that the influence of high relative humidity is much more obvious at lower temperature. And excitation intensity with oxygen appear to exacerbate degradation at high temperature but not as effective at lower cases.application/pdfen-USnoneMaterials ScienceMaterials science and engineeringThesis