Dual roles of doping and trapping of semiconductor defect levels and their ramification to thin film photovoltaics

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Abstract

It is pointed out that the semiconductor localized intrinsic/impurity defect levels' dual roles for carrier doping and trapping (Shockley-Read-Hall generation-recombination) have been treated differently and inconsistently. It is proposed that instead of ionization or activation energy, transition Gibbs free energy level should be used for the dual roles of doping-trapping. To qualitatively evaluate the effectiveness of doping and of trapping, the concept of doping efficacy η d and two types of trapping efficacy η t and η SRH are proposed. The relationship of η d, η t, and η SRH is formulated. Various values of η SRH for different types of defect levels are presented. General ramification of the proposed concepts and efficacy of trapping is explored for polycrystalline thin film solar cells.

Original languageEnglish (US)
Article number104509
JournalJournal of Applied Physics
Volume111
Issue number10
DOIs
StatePublished - May 15 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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