Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation

Meijun Lu, Ujjwal Das, Stuart Bowden, Steven Hegedus, Robert Birkmire

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

In this paper, two-dimensional (2D) simulation of interdigitated back contact silicon heterojunction (IBC-SHJ) solar cells is presented using Sentaurus Device, a software package of Synopsys TCAD. A model is established incorporating a distribution of trap states of amorphous-silicon material and thermionic emission across the amorphous-silicon / crystalline-silicon hetero-interface. The 2D nature of IBC-SHJ device is evaluated and current density-voltage (J-V) curves are generated. Optimization of IBC-SHJ solar cells is then discussed through simulation. It is shown that the open circuit voltage (VOC) and short circuit current density (JSC) of IBC-SHJ solar cells increase with decreasing front surface recombination velocity. The JSC improves further with the increase of relative coverage of p-type emitter contacts, which is explained by the simulated and measured position dependent laser beam induced current (LBIC) line scan. The S-shaped J-V curves with low fill factor (FF) observed in experiments are also simulated, and three methods to improve FF by modifying the intrinsic a-Si buffer layer are suggested: (i) decreased thickness, (ii) increased conductivity, and (iii) reduced band gap. With all these optimizations, an efficiency of 26% for IBC-SHJ solar cells is potentially achievable.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Pages1475-1480
Number of pages6
DOIs
StatePublished - 2009
Externally publishedYes
Event2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009 - Philadelphia, PA, United States
Duration: Jun 7 2009Jun 12 2009

Other

Other2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009
CountryUnited States
CityPhiladelphia, PA
Period6/7/096/12/09

Fingerprint

Heterojunctions
Solar cells
Silicon
Computer simulation
Amorphous silicon
Current density
Thermionic emission
Induced currents
Open circuit voltage
Buffer layers
Volatile organic compounds
Software packages
Short circuit currents
Laser beams
Energy gap
Crystalline materials
Electric potential
Experiments

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

Lu, M., Das, U., Bowden, S., Hegedus, S., & Birkmire, R. (2009). Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation. In Conference Record of the IEEE Photovoltaic Specialists Conference (pp. 1475-1480). [5411332] https://doi.org/10.1109/PVSC.2009.5411332

Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation. / Lu, Meijun; Das, Ujjwal; Bowden, Stuart; Hegedus, Steven; Birkmire, Robert.

Conference Record of the IEEE Photovoltaic Specialists Conference. 2009. p. 1475-1480 5411332.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lu, M, Das, U, Bowden, S, Hegedus, S & Birkmire, R 2009, Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation. in Conference Record of the IEEE Photovoltaic Specialists Conference., 5411332, pp. 1475-1480, 2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009, Philadelphia, PA, United States, 6/7/09. https://doi.org/10.1109/PVSC.2009.5411332
Lu M, Das U, Bowden S, Hegedus S, Birkmire R. Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation. In Conference Record of the IEEE Photovoltaic Specialists Conference. 2009. p. 1475-1480. 5411332 https://doi.org/10.1109/PVSC.2009.5411332
Lu, Meijun ; Das, Ujjwal ; Bowden, Stuart ; Hegedus, Steven ; Birkmire, Robert. / Optimization of interdigitated back contact silicon heterojunction solar cells by two-dimensional numerical simulation. Conference Record of the IEEE Photovoltaic Specialists Conference. 2009. pp. 1475-1480
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