SEMICONDUCTOR PHYSICS

Thermionic emission theory and diffusion theory applied to CdTe PV devices

Rumin Zhang1, 2, Yu Ruan1, Zhengyi Li1, Sichong Cheng1 and Dijun Liu3,

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 Corresponding author: Dijun Liu, E-mail: liudijun@leadcoretech.com

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Abstract: In this work, a comprehensive model that takes the phenomenon of carrier thermionic-emission within the frame work of a diffusion theory of current conducting into account in the type II hetero-junction CdTe solar cell is developed. According to this model, it is found that the total current flowing through the CdTe solar cell is limited by the thermionic process for very thin quasi-neutral regions and limited by the diffusion process for the reverse case. In future research of the CdTe solar cell, such an approach may enable the determination of the boundary conditions for all doping profiles and computation of the conversion efficiency, etc.

Key words: solar cellCdTetype II hetero-junctionthermionic emission theorydiffusion theory



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Fig. 1.  The Energy-band diagram of isolated n-CdS/p-CdTe type II hetero-junction[11].

Fig. 2.  Energy-band diagram of n-CdS/p-CdTe hetero-junction in thermal equilibrium.

Fig. 3.  Energy band diagram of forward biased CdTe/CdS heterojunction.

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    Received: 11 June 2014 Revised: Online: Published: 01 January 2015

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      Rumin Zhang, Yu Ruan, Zhengyi Li, Sichong Cheng, Dijun Liu. Thermionic emission theory and diffusion theory applied to CdTe PV devices[J]. Journal of Semiconductors, 2015, 36(1): 012002. doi: 10.1088/1674-4926/36/1/012002 R M Zhang, Y Ruan, Z Y Li, S C Cheng, D J Liu. Thermionic emission theory and diffusion theory applied to CdTe PV devices[J]. J. Semicond., 2015, 36(1): 012002. doi: 10.1088/1674-4926/36/1/012002.Export: BibTex EndNote
      Citation:
      Rumin Zhang, Yu Ruan, Zhengyi Li, Sichong Cheng, Dijun Liu. Thermionic emission theory and diffusion theory applied to CdTe PV devices[J]. Journal of Semiconductors, 2015, 36(1): 012002. doi: 10.1088/1674-4926/36/1/012002

      R M Zhang, Y Ruan, Z Y Li, S C Cheng, D J Liu. Thermionic emission theory and diffusion theory applied to CdTe PV devices[J]. J. Semicond., 2015, 36(1): 012002. doi: 10.1088/1674-4926/36/1/012002.
      Export: BibTex EndNote

      Thermionic emission theory and diffusion theory applied to CdTe PV devices

      doi: 10.1088/1674-4926/36/1/012002
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      • Corresponding author: E-mail: liudijun@leadcoretech.com
      • Received Date: 2014-06-11
      • Accepted Date: 2014-07-01
      • Published Date: 2015-01-25

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