Research On Efficient Perovskite Solar Cells Based On Composite Electron Transport Layer Structure

Since Tsutomu Miyasaka produced the first perovskite solar cell in 2009,the structure of organometallic halide perovskite solar cells has been continuously optimized.From the sensitized structure in the beginning,to the mesoporous structure,the columnar structure,and then to the current planar structure,the preparation process of perovskite solar cells has become more and more simple,the repeatability has become stronger and stronger,and the photoelectric conversion efficiency has increased from 3.81% to 25.2% rapidly.The improvement of the photoelectric conversion efficiency of organic metal halide perovskite solar cells stems from many aspects,including optimization of perovskite composition,optimization of charge transport materials,utilization of interface engineering,and improvement of process methods.In the experimental research conducted in this paper,the structure of perovskite solar cells is all positive,and the perovskite materials,hole transport materials,and electrode materials are also completely the same.The only difference is the electron transport material.The main research contents are the effect of the structure of the composite electron transport layer on the performance of the perovskite solar cell,and the effect of the preparation method of titanium dioxide in the electron transport layer on the performance of the solar cell.We hope to improve the photoelectric conversion efficiency of perovskite solar cells by combining different electron transport materials as the electron transport layer.In addition,we hope that by optimizing the preparation method of titanium dioxide,the process temperature can be reduced without affecting the photoelectric conversion efficiency of the perovskite solar cell.The research steps are:1)First,a batch of perovskite solar cells with traditional planar structure are prepared.Their electron transport layer are single-layer materials,including titanium dioxide and tin dioxide.Then the photovoltaic performances of the solar cells are tested.2)First,the perovskite solar cells in the previous step are used as a reference device.Then,a layer of fullerene derivative PCBM is added above the single-layer electron transport layer to form a double-layer composite electron transport layer,and the manufactured solar cells are used as comparison devices.Finally,the photovoltaic performances of the solar cells are tested,and the reference devices and the comparison devices are compared.3)First,the comparison devices in the previous step are used as the reference device.Then,three electron transport materials are combined together as a three-layer composite electrontransporting layer,and the manufactured solar cells are used as comparison devices.Finally,the photovoltaic performances of the solar cells are tested,and the reference devices and the comparison devices are compared.4)First,the comparison devices in the previous step are used as the reference device.Then,the preparation process of titanium dioxide is improved(ALD),and the prepared solar cells are used as comparative devices.Finally,the photovoltaic performances of the solar cells are tested,and the reference devices and the comparison devices are compared.