Novel Processing Method for High Performance Perovskite Solar Cells

Abstract

Thin-film perovskite solar cells (TFPSC) based on alkylammonium lead iodide materials have attracted significant attention as a promising candidate for next generation energy source because of their advantages such as low cost, high mobility and high device performance. Although the technology of TFPSC has been quickly developed so far, further enhancements in device performance and reducing production costs are required for commercialization. In this work, a simple and effective processing method was developed for high performance of CH3NH3PbI3−xClx TFPSC. By employing a moisture pretreatment (MPT) and a novel hot-air annealing process (HAAP) for preparing perovskite CH3NH3PbI3−xClx film, a significant enhancement has been achieved in crystalline and photon collection of CH3NH3PbI3−xClx active layer, which obviously improved the device performance of the TFPSC. When the TFPSC with structure of glass substrate/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene)-poly (styrenesulfonate)(PEDOT:PSS) / CH3NH3PbI3−xClx active layer / [6,6]-phenyl-C61 -butyric acid methyl ester (PC61BM)/Ca/Al was fabricated using MPT process and HAAP method, the device shows more than 70% enhanced power conversion efficiency (PCE) with significant increased fill factor (FF) compared to the pristine device.