Measurement of Relaxation Time of Excess Carriers in Si and CIGS Solar Cells by Modulated Electroluminescence Technique
| Autor: | Pradeep R. Nair, Krishnamachari L. Narsimhan, Sanchit Khatavkar, Juzer Vasi, Maikel F.A.M. van Hest, Chinna V. Kannan, Kulasekaran Muniappan, Brij M. Arora, Vijay Kumar, Miguel A. Contreras |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
EFFICIENCY Si-HJ solar cells modulated electroluminescence 02 engineering and technology LIFETIME Quantum dot solar cell Electroluminescence 01 natural sciences SEMICONDUCTORS 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering relaxation time 010302 applied physics CU(IN GA)SE-2 business.industry Surfaces and Interfaces Frequency dependence 021001 nanoscience & nanotechnology Condensed Matter Physics Copper indium gallium selenide solar cells Surfaces Coatings and Films Electronic Optical and Magnetic Materials frequency dependence CRYSTALLINE-SILICON-WAFERS Optoelectronics PHOTOLUMINESCENCE 0210 nano-technology business CIGS solar cells |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| Popis: | Excess carrier lifetime plays a crucial role in determining the efficiency of solar cells. In this paper, we use the frequency dependence of inphase and quadrature components of modulated electroluminescence (MEL) to measure the relaxation time (decay) of excess carriers. The advantage of the MEL technique is that the relaxation time is obtained directly from the angular frequency at which the quadrature component peaks. It does not need knowledge of the material parameters like mobility, etc., and can be used for any finished solar cells which have detectable light emission. The experiment is easy to perform with standard electrical equipment. For silicon solar cells, the relaxation time is dominated by recombination and hence, the relaxation time is indeed the excess carrier lifetime. In contrast, for the CIGS solar cells investigated here, the relaxation time is dominated by trapping and emission from shallow minority carrier traps. |
| Databáze: | OpenAIRE |
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