Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6535070 | Solar Energy Materials and Solar Cells | 2015 | 8 Pages |
Abstract
Reaction path for fabrication of Cu2SnSe3 (CTSe) film by selenization of Cu-Sn precursor was investigated via in-situ X-ray diffraction (XRD) as well as glazing incident XRD (GIXRD) measurements. Cross-sectional scanning electron microscopy (SEM)-energy dispersive spectrometry (EDS) and transmission electron microscope (TEM) analyses revealed the element and phase distribution along the depth direction. Based on these results, a proposed growth model was concluded below: first, the Se atoms from evaporation source reacted with Cu and Sn atoms to produce Cu2âxSe and SnSe2 phases. Noticeably, resulting film presented bilayer feature with Cu2âxSe located at the surface and SnSe2 located at bottom. Second, CTSe phase formed at the interface of Cu2âxSe and SnSe2 as the increasing temperature. The Cu2âxSe was depleted by Sn-related secondary phases when the Cu/Sn ratio was smaller than 1.72. The secondary phases of SnSe2 and SnSe were coexisted with CTSe phase independent of Cu/Sn ratio in metallic precursor, which was attributed to the weak diffusion ability of Sn and Sn-related secondary phases in the CTSe film. The origins for high carrier concentration in CTSe films were ascribed to the Cu2âxSe and intrinsic acceptor concentration and effective approach to reduce the value was explored. An attempt of solar cell with CTSe as absorber was performed and photocurrent of 9.9Â mA/cm2 was detected.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Zeguo Tang, Kenta Aoyagi, Yuki Nukui, Kiichi Kosaka, Hikaru Uegaki, Jakapan Chatana, Daisuke Hironiwa, Takashi Minemoto,