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Nano-scale observation of charge transport and potential distribution of photovoltaic Cu(In,Ga)Se 2 thin-films

Title
Nano-scale observation of charge transport and potential distribution of photovoltaic Cu(In,Ga)Se 2 thin-films
Authors
Jeong A.R.Jo W.Jo H.J.Kim D.-H.Sung S.J.Kang J.K.Lee D.H.Nam D.H.Park D.Y.Cheong H.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2011
Journal Title
2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011
Indexed
SCOPUS scopus
Abstract
Understanding of grain boundary (GB) is critical for photovoltaic applications since electron-hole recombination at GBs determines the conversion efficiency. However, our local electrical and optical analysis shows positive potential at GBs in Cu(In,Ga)Se 2 (CIGS), which suppresses the recombination at GBs. We report on a direct measurement of potential distribution and local electrical transport on the surface of photovoltaic CIGS using a nano-scale electrical characterization of Kelvin probe microscopy and conductive atomic force microscopy. This reveals that the positively charged surface potential at GB is expected to increase the minority carrier collection and the enhanced current at GB leads to large carrier mobility and electron-hole separation at the GBs. Micro-Raman scattering results helps to analyze electrical behavior from defect analysis. © 2011 IEEE.
DOI
10.1109/NMDC.2011.6155335
ISBN
9781457721397
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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