Hostname: page-component-7bb8b95d7b-2h6rp Total loading time: 0 Render date: 2024-09-15T13:45:01.538Z Has data issue: false hasContentIssue false
  • English
  • Français

Defect Densities and Carrier Lifetimes in Oxygen doped Nanocrystalline Si

Published online by Cambridge University Press:  20 June 2013

Shantan Kajjam ,
Siva Konduri ,
Max Noack ,
G. Shamshimov ,
N. Ussembayev  and
Vikram Dalal
Shantan Kajjam
Affiliation:
Department of Electrical & Computer Engineering, Iowa State University, Ames IA 50014
Siva Konduri
Affiliation:
Department of Electrical & Computer Engineering, Iowa State University, Ames IA 50014
Max Noack
Affiliation:
Microelectronics Research Center, Iowa State University, Ames IA 50014
G. Shamshimov
Affiliation:
Nazarbayev University, Astana, Kazakhstan
N. Ussembayev
Affiliation:
Nazarbayev University, Astana, Kazakhstan
Vikram Dalal
Affiliation:
Department of Electrical & Computer Engineering, Iowa State University, Ames IA 50014
Get access

Abstract

We report on the measurement of defect densities and minority carrier lifetimes in nanocrystalline Si samples contaminated with controlled amounts of oxygen. Two different measurement techniques, a capacitance-frequency (CF) and high temperature capacitance-voltage techniques were used. CF measurement is found to yield noisy defect profiles that could lead to inconclusive results. In this paper, we show an innovative technique to remove the noise and obtain clean data using wavelet transforms. This helps us discover that oxygen is creating both shallow and deep/midgap defect states in lieu with crystalline silicon. Minority carrier lifetime measured using reverse recovery techniques shows excellent inverse correlation between deep defects and minority carrier lifetimes through which hole capture cross section can be evaluated.

Keywords

Siphotovoltaicplasma-enhanced CVD (PECVD) (deposition)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1536: Symposium A – Film Silicon Science and Technology , 2013 , pp. 169 - 173
Copyright
Copyright © Materials Research Society 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Shah, J. Meier, E. Vallat-Sauvain, N. Wyrsch, U. Kroll, C. Droz, U. Graf, Solar Energy Materials and Solar Cells 78 (2003) 469–491.10.1016/S0927-0248(02)00448-8CrossRefGoogle Scholar
Kilper, T., Beyer, W., Brauer, G., Bronger, T., Carius, R., van den Donker, M., Hrunski, D., Lambertz, A., Merdzhanova, T., Muck, A., Journal of Applied Physics 105 (2009) 074509–074509-074510.10.1063/1.3104781CrossRefGoogle Scholar
Hugger, P.G., Cohen, J.D., Yan, B., Yue, G., Yang, J., Guha, S., Applied Physics Letters 97 (2010) 252103.CrossRefGoogle Scholar
Misiti, Michel, et al. . “Wavelet toolbox.” The MathWorks Inc., Natick, MA (1996).Google Scholar
Kimerling, L. C., J. Appl. Phys. 45, 1839 (1974)10.1063/1.1663500CrossRefGoogle Scholar
Walter, T., Herberholz, R., Muller, C., Schock, H., Journal of Applied Physics 80 (1996) 4411–4420.10.1063/1.363401CrossRefGoogle Scholar
Lax, B., Neustadter, S., Journal of Applied Physics 25 (1954) 1148–1154.10.1063/1.1721830CrossRefGoogle Scholar
Saripalli, S., Dalal, V., Journal of Non-Crystalline Solids 354.19 (2008): 2426–2429.10.1016/j.jnoncrysol.2007.10.060CrossRefGoogle Scholar
Sze, Simon M., and Ng, Kwok K.. “Physics of Semiconductor Devices”. (Wiley-Interscience, 2006).10.1002/0470068329CrossRefGoogle Scholar