Optical Absorption, Charge Separation and Recombination Dynamics in Pb and Sn/Pb Cocktail Perovskite Solar Cells and Their Relationships to the Photovoltaic Properties

Abstract

Due to the unique characteristics such as simple low-temp. prepn. method and high efficiency with a record of over 20%, organometal trihalide perovskite (CH3NH3PbI3)-based solid-state hybrid solar cells have attracted an increasing interest since 2012 when it was reported. During the last several years, some of the fundamental photophys. properties of perovskite related to the high photovoltaic performance have been investigated. Optical absorption, charge sepn. and recombination are very important factors influencing the perovskite solar cell performance. In this chapter, our recent results of optical absorption, charge sepn. (electron and hole injection) and charge recombination dynamics at each interface in perovskite solar cells, and their relationships to photovoltaic properties will be introduced. Our results suggest that charge recombination is a key factor in improving the performance of the perovskite solar cells. [on SciFinder(R)]