Meyer-Neldel Rule and the Influence of Entropy on Capture Cross-Section Determination in Cu(In,Ga)Se2

Jehad A.M. Abushama, S. W. Johnston, R. S. Crandall, R. Noufi

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Abstract

We use deep-level transient spectroscopy (DLTS) to investigate the electronic properties of ZnOCdS Cux In1-y Gay Se2 Mo soda-lime glass thin-film solar cells. We deposited films with different x and y values using elemental evaporation. Devices made from these films exhibit more than 40 hole and electron traps, with activation energies ranging from 0.07 to 1.17 eV. Standard DLTS analysis (which assumes that entropy changes can be neglected) gives apparent capture cross sections that vary by 18 orders of magnitude over this energy range. All our data show that the charge-carrier emission rate obeys the Meyer-Neldel rule (MNR) with an isokinetic temperature of 340±30 K. By including the MNR relation in detailed balance, we show that there is a single cross section for all the traps.

Original languageAmerican English
Article number123502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number12
DOIs
StatePublished - 19 Sep 2005

NREL Publication Number

  • NREL/JA-520-38029

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