Determination of Electron Affinity of In2 O 3 from Its Heterojunction Photovoltaic Properties

Abstract

, , , and heterojunction solar cells have been fabricated and their photovoltaic properties have been investigated. All devices show rectifying and photovoltaic effects. The experimental results can be explained by a simple heterojunction energy band diagram. In order to match the experimentally observed polarities of the open‐circuit voltage and short‐circuit current of these heterojunction solar cells, the electron affinity of materials is determined to be 4.45 eV. The substrate‐resistivity dependence of open‐circuit voltage is consistent with the energy band diagram using the electron affinity value of 4.45 eV for .