Enhanced efficiency of graphene/silicon heterojunction solar cells by molecular doping

Tongxiang Cui; Ruitao Lv; Zheng-Hong Huang; Shuxiao Chen; Zexia Zhang; Xin Gan; Yi Jia; Xinming Li; Kunlin Wang; Dehai Wu; Feiyu Kang

doi:10.1039/C3TA01634J

Enhanced efficiency of graphene/silicon heterojunction solar cells by molecular doping†

Tongxiang Cui,^a Ruitao Lv,*^ab Zheng-Hong Huang,^a Shuxiao Chen,^a Zexia Zhang,^a Xin Gan,^a Yi Jia,^c Xinming Li,^a Kunlin Wang,^a Dehai Wu^a and Feiyu Kang*^ac

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* Corresponding authors

^a Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
E-mail: fykang@tsinghua.edu.cn
Fax: +86 10 6277 1160
Tel: +86 10 6277 3752

^b Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA
E-mail: rxl40@psu.edu
Tel: +1 814 865-0343

^c City Key Laboratory of Thermal Management Engineering and Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen, Guangdong Province, China

Abstract

Graphene (G) films were grown on copper foils by chemical vapor deposition and transferred onto n-type silicon (Si) to form G/Si Schottky heterojunction solar cells. The power conversion efficiencies (PCEs) of the G/Si solar cells were in the range of 1.94–2.66%. Four volatile oxidants HNO₃, HCl, H₂O₂ and SOCl₂ were employed to treat the graphene films in the G/Si solar cells, and the PCEs could be greatly enhanced after being treated by all the volatile oxidants and SOCl₂ doping showed the best improvement. A solar cell with an initial PCE of 2.45% could be increased to 5.95% upon SOCl₂ doping treatment. The PCE stability of the volatile oxidant-treated cells was also investigated. The PCEs decreased with time, while SOCl₂ and HCl showed much better PCE stability than HNO₃ and H₂O₂.

Journal of Materials Chemistry A

Enhanced efficiency of graphene/silicon heterojunction solar cells by molecular doping†

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