Electroabsorption measurements and built-in potentials in amorphous silicon p-i-n solar cells

Lin Jiang, Qi Wang, E. A. Schiff, S. Guha, J. Yang, Xunming Deng

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We present a technique for using modulated electroabsorption measurements to determine the built-in potential in semiconductor heterojunction devices. The technique exploits a simple relationship between the second-harmonic electroabsorption signal and the capacitance of such devices. We apply this technique to hydrogenated amorphous silicon (a-Si:H)-based solar cells incorporating microcrystalline Si p+ layers. For one set of cells with a conventional plasma-deposited intrinsic (i) layer we obtain a built-in potential of 0.98±0.04 V; for cells with an i layer deposited using strong hydrogen dilution we obtain 1.25±0.04 V. We speculate that interface dipoles between the p+ and i layers significantly influence the built-in potential.

Original languageEnglish (US)
Pages (from-to)3063-3065
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number20
DOIs
StatePublished - Nov 11 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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