Study on silicon nanostructure based solar cell by ultrafast terahertz spectroscopy

Longyao Peng; Liguo Zhu; Hao Tang; Kun Meng; Sencheng Zhong; Zeren Li; Rongzhu Zhang

doi:10.1117/12.2033123

23 August 2013 Study on silicon nanostructure based solar cell by ultrafast terahertz spectroscopy

Longyao Peng, Liguo Zhu, Hao Tang, Kun Meng, Sencheng Zhong, Zeren Li, Rongzhu Zhang

Proceedings Volume 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications; 89090K (2013) https://doi.org/10.1117/12.2033123
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Recently, Silicon nanowires(Si NWs) have been suggested as a promising candidate for solar energy harvesting. The Si NWs have the advantage of enhancing the optical absorption for broadband spectra, which increases the optical absorption significantly. It is of crucial importance for high efficiency solar cell. We applied the transient optical-pump THz emission spectroscopy to research Si NWs fabricated by chemical etching and to analyse the THz radiation mechanism. The experiment datas indicated that Si NWs enhance the optical absorption significantly. And the lifetime and dynamics properties of photoexcited carriers are important to the photovoltaic conversion efficiency of solar cell. Here the optical-pump terahertz-probe system was employed to study the ultrafast dynamics and transport properties of photoexcited carriers in Si NWs. The experiment results shown that carrier lifetime in Si NWs is approximate 0.7ns, and it reduces optical energy-conversion efficiencies of solar cell. However, compared to other silicon nanostructures, Si NWs fabricated by chemical etching have relative high values for both the carrier lifetime and mobility. The detailed analysis of the optical absorption and carriers dynamics would be significant for optimizing configuration of the silicon nanostructures.

Citation Download Citation

Longyao Peng, Liguo Zhu, Hao Tang, Kun Meng, Sencheng Zhong, Zeren Li, and Rongzhu Zhang "Study on silicon nanostructure based solar cell by ultrafast terahertz spectroscopy", Proc. SPIE 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications, 89090K (23 August 2013); https://doi.org/10.1117/12.2033123

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