The Preparation Of Photoanode Applied To Perovskite Solar Cells And Device Research

Since the beginning of the twenty-first century, the demand for energy isgrowing with the continuous development of the global economy and technology. Asthe reserves of traditional energy are limited, and will be depleted eventually one day,in addition the use of traditional energy sources cause great environmental pollution,it is imperative to develop new energy sources. Solar energy is of abundant andendless reserves, also it doesn’t pollute the environment, thus becomes the focus ofthe development of new energy. Since it was firstly reported in2009, it only takesfive years to make such a significantly improvement that the power conversionefficiency of perovskite solar cells has been improved from3.8%to20.1%.Perovskite solar cells has already become the most popular research field of solarcells as a result of its high photoelectric conversion efficiency, simple preparationprocess and low production cost.This paper reported on the preparation of photoanode material applied to perovskitesolar cells and assembled the photoanode into battery devices，and characterized themorphology of the samples. Specific contents are as following.1. We had grown TiO2thin films on FTO conductive glass substrate by chemicalbath and hydrothermal method. In the synthesis process, we changed titanium source(TiCl3) and hydrochloric acid (HCl) ratio and thus obtained nanostructured TiO2thinfilms with different morphologies. Under the optimized reaction conditions, weprepared uniformly distributed TiO2nanorod arrays on FTO conductive substrate.TiO2nanorod arrays were with the mixed phases of anatase and rutile anatase grewalong the [101] direction. We obtained from the SEM images that the uniformlydistributed with rod diameter about20nm and the height of rod arrays about500nm.2. We had grown ZnO thin films on FTO conductive glass substrate by chemicalbath and hydrothermal method on FTO. By changing sources of zinc (Zn (NO3)2.6H20) and (CO (NH2)2) ratio in the synthesis process, we achieved the control ofZnO morphology. The phase struction of unannealed and annealed film samples wasanalysised by Philips X-Perf Pro X-ray diffractometer(excitation source Cu-K, λ=1.54056); using Sirion200type field emission scanning electron microscope(accelerating voltage of15kV) to analysis the morphology of the samples prepared. Eventually, through the control of the experimental, we prepared uniform andvertical ZnO nanosheet arrays grew on the FTO conductive glass substrate.3.We prepared the photoanode of the perovskite solar cells utilizing ZnO nanosheetarrays and prepared perovskite solar cells. Then, we directly spin-coatedCH3NH3PbI3on ZnO thin films by two-step method of liquid phase. We selectedSpiro-MeOTAD as hole transport layer by spin coating and finally sprayed Au as thebackelectrode of the battey, and completed the preparation of the battery device. Thebattery characterized by SEM and the struction was preliminary analysised by XRD.