Journal Article

FZJ-2021-01153

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Improved Infrared Light Management with Transparent Conductive Oxide/Amorphous Silicon Back Reflector in High‐Efficiency Silicon Heterojunction Solar Cells

Duan, W. (Corresponding author)FZJ* ; Bittkau, K. (Corresponding author)FZJ* ; Lambertz, A.FZJ* ; Qiu, K. ; Yao, Z. ; Steuter, P. ; Qiu, D.FZJ* ; Rau, U.FZJ* ; Ding, K.FZJ*

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/30275  doi:10.1002/solr.202000576

Abstract: To improve the infrared (IR) response, a high-refractive-index intrinsic amorphous silicon (a-Si:H) layer is introduced after metallization of bifacial silicon heterojunction (SHJ) solar cells, resulting in a transparent conductive oxide (TCO)/a-Si:H back reflector, which functions like distributed Bragg reflector (DBR). This concept is demonstrated by both Sentaurus Technology Computer-Aided Design (TCAD) simulation and experimental methods. The TCO/a-Si:H back reflector can increase rear internal reflectance by reducing the transmission loss, thus improving the IR external quantum efficiency. The using of Sn-doped In2O3 (ITO)/a-Si:H back reflector in >23.5% efficiency SHJ solar cells can improve short-circuit current density by 0.4 mA cm2 which is quite similar as using the more expensive ITO/Ag back reflector, while keeping a cell bifaciality of 55%. This brings its advantage for monofacial application case. Future studies would be nice to work on higher transparent back reflectors to broaden the application in bifacial case. This back-reflector design promotes IR response of SHJ solar cells with transferring to a wide variety of TCOs.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 1213 - Cell Design and Development (POF4-121) (POF4-121)
2. Verbundvorhaben: Street - Einsatz von hocheffizienten Solarzellen in elektrisch betriebenen Nutzfahrzeugen; Teilvorhaben: Herstellung und Entwicklung von (0324275E) (0324275E)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; Science Citation Index Expanded ; Web of Science Core Collection

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