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Title: Silicon heterojunction solar cells with effectively transparent front contacts

Abstract

We demonstrate silicon heterojunction solar cells with microscale effectively transparent front contacts (ETCs) that redirect incoming light to the active area of the solar cell. Replacing standard contact electrodes by ETCs leads to an enhancement in short circuit current density of 2.2 mA cm –2 through mitigation of 6% shading losses and improved antireflection layers. ETCs enable low loss lateral carrier transport, with cells achieving an 80.7% fill factor. Furthermore, dense spacing of the contact lines allows for a reduced indium tin oxide thickness and use of non-conductive, optically optimized antireflection coatings such as silicon nitride. We investigated the performance of ETCs under varying light incidence angles, and for angles parallel to the ETC lines find that there is no difference in photocurrent density with respect to bare indium tin oxide layers. In conclusion, for angles perpendicular to the ETC lines, we find that the external quantum efficiency (EQE) always outperforms cells with flat contact grids.

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Arizona State Univ., Tempe, AZ (United States)
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1579846
Grant/Contract Number:  
EE0004946; EE0006335; EEC-1041895
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Sustainable Energy & Fuels
Additional Journal Information:
Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 2398-4902
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Saive, Rebecca, Boccard, Mathieu, Saenz, Theresa, Yalamanchili, Sisir, Bukowsky, Colton R., Jahelka, Phillip, Yu, Zhengshan J., Shi, Jianwei, Holman, Zachary, and Atwater, Harry A. Silicon heterojunction solar cells with effectively transparent front contacts. United States: N. p., 2017. Web. doi:10.1039/c7se00096k.
Saive, Rebecca, Boccard, Mathieu, Saenz, Theresa, Yalamanchili, Sisir, Bukowsky, Colton R., Jahelka, Phillip, Yu, Zhengshan J., Shi, Jianwei, Holman, Zachary, & Atwater, Harry A. Silicon heterojunction solar cells with effectively transparent front contacts. United States. doi:10.1039/c7se00096k.
Saive, Rebecca, Boccard, Mathieu, Saenz, Theresa, Yalamanchili, Sisir, Bukowsky, Colton R., Jahelka, Phillip, Yu, Zhengshan J., Shi, Jianwei, Holman, Zachary, and Atwater, Harry A. Mon . "Silicon heterojunction solar cells with effectively transparent front contacts". United States. doi:10.1039/c7se00096k. https://www.osti.gov/servlets/purl/1579846.
@article{osti_1579846,
title = {Silicon heterojunction solar cells with effectively transparent front contacts},
author = {Saive, Rebecca and Boccard, Mathieu and Saenz, Theresa and Yalamanchili, Sisir and Bukowsky, Colton R. and Jahelka, Phillip and Yu, Zhengshan J. and Shi, Jianwei and Holman, Zachary and Atwater, Harry A.},
abstractNote = {We demonstrate silicon heterojunction solar cells with microscale effectively transparent front contacts (ETCs) that redirect incoming light to the active area of the solar cell. Replacing standard contact electrodes by ETCs leads to an enhancement in short circuit current density of 2.2 mA cm–2 through mitigation of 6% shading losses and improved antireflection layers. ETCs enable low loss lateral carrier transport, with cells achieving an 80.7% fill factor. Furthermore, dense spacing of the contact lines allows for a reduced indium tin oxide thickness and use of non-conductive, optically optimized antireflection coatings such as silicon nitride. We investigated the performance of ETCs under varying light incidence angles, and for angles parallel to the ETC lines find that there is no difference in photocurrent density with respect to bare indium tin oxide layers. In conclusion, for angles perpendicular to the ETC lines, we find that the external quantum efficiency (EQE) always outperforms cells with flat contact grids.},
doi = {10.1039/c7se00096k},
journal = {Sustainable Energy & Fuels},
issn = {2398-4902},
number = 3,
volume = 1,
place = {United States},
year = {2017},
month = {2}
}

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Cited by: 15 works
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Works referenced in this record:

Development of New a-Si/c-Si Heterojunction Solar Cells: ACJ-HIT (Artificially Constructed Junction-Heterojunction with Intrinsic Thin-Layer)
journal, November 1992

  • Tanaka, Makoto; Taguchi, Mikio; Matsuyama, Takao
  • Japanese Journal of Applied Physics, Vol. 31, Issue Part 1, No. 11
  • DOI: 10.1143/JJAP.31.3518

Ideal transparent conductors for full spectrum photovoltaics
journal, June 2012

  • Yu, Kin Man; Mayer, Marie A.; Speaks, Derrick T.
  • Journal of Applied Physics, Vol. 111, Issue 12
  • DOI: 10.1063/1.4729563

Transparent Conducting Silver Nanowire Networks
journal, May 2012

  • van de Groep, Jorik; Spinelli, Pierpaolo; Polman, Albert
  • Nano Letters, Vol. 12, Issue 6
  • DOI: 10.1021/nl301045a

>750 mV open circuit voltage measured on 50 μ m thick silicon heterojunction solar cell
journal, July 2013

  • Herasimenka, Stanislau Y.; Dauksher, William J.; Bowden, Stuart G.
  • Applied Physics Letters, Vol. 103, Issue 5
  • DOI: 10.1063/1.4817723

Development of nanoimprint processes for photovoltaic applications
journal, July 2015

  • Hauser, Hubert; Tucher, Nico; Tokai, Katharina
  • Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 14, Issue 3
  • DOI: 10.1117/1.JMM.14.3.031210

Shading losses of solar‐cell metal grids
journal, May 1992

  • Blakers, A. W.
  • Journal of Applied Physics, Vol. 71, Issue 10
  • DOI: 10.1063/1.350580

Past achievements and future challenges in the development of optically transparent electrodes
journal, November 2012


High-mobility hydrogen-doped In2O3In2O3 transparent conductive oxide for a-Si:H/c-Si heterojunction solar cells
journal, June 2009


Catoptric electrodes: transparent metal electrodes using shaped surfaces
journal, January 2014


High aspect ratio electrodeposited Ni/Au contacts for GaAs-based III-V concentrator solar cells: Electrodeposited Ni/Au contacts for GaAs based concentrator solar cells
journal, March 2014

  • Ward, J. Scott; Duda, Anna; Friedman, Daniel J.
  • Progress in Photovoltaics: Research and Applications, Vol. 23, Issue 5
  • DOI: 10.1002/pip.2490

Self-consistent optical parameters of intrinsic silicon at 300K including temperature coefficients
journal, November 2008


Transparent Metallic Fractal Electrodes for Semiconductor Devices
journal, August 2014

  • Afshinmanesh, Farzaneh; Curto, Alberto G.; Milaninia, Kaveh M.
  • Nano Letters, Vol. 14, Issue 9
  • DOI: 10.1021/nl501738b

Cerium oxide and hydrogen co-doped indium oxide films for high-efficiency silicon heterojunction solar cells
journal, May 2016


Increasing light capture in silicon solar cells with encapsulants incorporating air prisms to reduce metallic contact losses
journal, January 2016

  • Chen, Fu-hao; Pathreeker, Shreyas; Kaur, Jaspreet
  • Optics Express, Vol. 24, Issue 22
  • DOI: 10.1364/OE.24.0A1419

Low-Temperature High-Mobility Amorphous IZO for Silicon Heterojunction Solar Cells
journal, September 2015

  • Morales-Masis, Monica; Martin De Nicolas, Silvia; Holovsky, Jakub
  • IEEE Journal of Photovoltaics, Vol. 5, Issue 5
  • DOI: 10.1109/JPHOTOV.2015.2450993

Large-area soft-imprinted nanowire networks as light trapping transparent conductors
journal, June 2015

  • van de Groep, Jorik; Gupta, Dhritiman; Verschuuren, Marc A.
  • Scientific Reports, Vol. 5, Issue 1
  • DOI: 10.1038/srep11414

Cloaked contact grids on solar cells by coordinate transformations: designs and prototypes
journal, January 2015

  • Schumann, Martin F.; Wiesendanger, Samuel; Goldschmidt, Jan Christoph
  • Optica, Vol. 2, Issue 10
  • DOI: 10.1364/OPTICA.2.000850

Hydrogen-doped indium oxide/indium tin oxide bilayers for high-efficiency silicon heterojunction solar cells
journal, August 2013


Performance enhancement of metal nanowire transparent conducting electrodes by mesoscale metal wires
journal, September 2013

  • Hsu, Po-Chun; Wang, Shuang; Wu, Hui
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms3522

Effectively Transparent Front Contacts for Optoelectronic Devices
journal, June 2016

  • Saive, Rebecca; Borsuk, Aleca M.; Emmer, Hal S.
  • Advanced Optical Materials, Vol. 4, Issue 10
  • DOI: 10.1002/adom.201600252

Hybrid Metal–Semiconductor Nanostructure for Ultrahigh Optical Absorption and Low Electrical Resistance at Optoelectronic Interfaces
journal, October 2015


A New Architecture for Transparent Electrodes: Relieving the Trade-Off Between Electrical Conductivity and Optical Transmittance
journal, April 2011


Graphene oxide-based transparent conductive films
journal, July 2014


    Works referencing / citing this record:

    Microchannel contacting of crystalline silicon solar cells
    journal, August 2017


    Microchannel contacting of crystalline silicon solar cells
    journal, August 2017