Rear surface passivation of interdigitated back contact silicon heterojunction solar cell and 2D simulation study

Meijun Lu, Ujjwal Das, Stuart Bowden, Robert Birkmire

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

6 Scopus citations

Abstract

Rear surface passivation by deposited intrinsic amorphous silicon (a-Si) buffer layer in interdigitated back contact silicon heterojunction (IBC-SHJ) solar cells significantly improves open circuit voltage (VOC) and short circuit current (JSC) but can lead to very low fill factor (FF) with an 'S' shape J-V curve. In this paper, methods to optimize IBC-SHJ solar cell with improved FF are discussed and guided by two-dimensional numerical modelling. Two approaches to improve FF by modifying the buffer layer are evaluated: (1) increased conductivity, or (2) reduced band gap. Experimental results show that replacing the intrinsic a-Si layer in emitter with lightly doped p-type a-Si layer greatly improves fill factor, which is consistent with modelling prediction. However, the VOC and JSC are limited by the high recombination velocity of the unpassivated gap between the emitter and contact strips. The importance of gap passivation to achieve high efficiency in the IBC-SHJ structure was verified by 2D device simulation. The band gap of the intrinsic buffer layers have been reduced by changing the deposition conditions without substantially decreasing the passivation quality.

Original languageEnglish (US)
Title of host publication33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
DOIs
StatePublished - Dec 1 2008
Externally publishedYes
Event33rd IEEE Photovoltaic Specialists Conference, PVSC 2008 - San Diego, CA, United States
Duration: May 11 2008May 16 2008

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
CountryUnited States
CitySan Diego, CA
Period5/11/085/16/08

ASJC Scopus subject areas

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

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    Lu, M., Das, U., Bowden, S., & Birkmire, R. (2008). Rear surface passivation of interdigitated back contact silicon heterojunction solar cell and 2D simulation study. In 33rd IEEE Photovoltaic Specialists Conference, PVSC 2008 [4922757] (Conference Record of the IEEE Photovoltaic Specialists Conference). https://doi.org/10.1109/PVSC.2008.4922757