Spectrally and time resolved photoluminescence analysis of the CdS/CdTe interface in thin-film photovoltaic solar cells

Darius Kuciauskas, Ana Kanevce, Joel N. Duenow, Pat Dippo, Matthew Young, Jian V. Li, Dean H. Levi, Timothy A. Gessert

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Light absorption and charge separation in thin-film polycrystalline cadmium telluride (CdTe) photovoltaic (PV) solar cells largely occur in the vicinity of the CdS/CdTe interface. Sulfur alloying at this interface to form CdS xTe1x and doping with Cu appear to be important for efficient PV devices. Based on the different band gaps of CdSxTe 1x and CdTe, we apply spectroscopic and computational photoluminescence (PL) analysis to characterize this interface. We find that Cu concentration changes the dynamics of charge separation and PL emission intensities from the CdSxTe1x and CdTe regions. We have determined charge separation lifetime and minority carrier lifetime, and we have estimated minority carrier mobility as 100 cm2 V-1 s -1.

Original languageEnglish
Article number173902
JournalApplied Physics Letters
Volume102
Issue number17
DOIs
Publication statusPublished - 2013 Apr 29

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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