Abstract
Scanning capacitance microscopy (SCM) often shows a change in contrast at grain boundaries [1-3]. The origins of this contrast and the efficacy of SCM as a tool to identify band bending at grain boundaries in pc-Si and mc-Si are discussed. Contrast at these grain boundaries could be influenced by different oxide growth rates or by defect states at the oxide interface. In order to determine the influence of such mechanisms on the SCM signal, such effects must be modeled; we show that a simple one-dimensional model agrees well with more detailed models of SCM signal strength and indicates, for example, that very small changes in oxide thickness measurably affect the SCM signal. In our experimental data, the uniformity and quality of the oxide layer are confirmed, and increased contrast consistent with depletion regions is still observed at higher order grain boundaries as identified by electron backscattering diffraction, including ∑9 and ∑27a. Scans of the SCM signal as a function of dc probe voltage allow such regions to be more quantitatively investigated.
Original language | American English |
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Pages | 25-30 |
Number of pages | 6 |
DOIs | |
State | Published - 2010 |
Event | Materials Research Society Symposium - San Francisco, California Duration: 5 Apr 2010 → 9 Apr 2010 |
Conference
Conference | Materials Research Society Symposium |
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City | San Francisco, California |
Period | 5/04/10 → 9/04/10 |
NREL Publication Number
- NREL/CP-520-47978
Other Report Number
- Paper No. 1268-EE07-10
Keywords
- cell efficiency
- device performance
- solar cells