Lithography-free and dopant-free back-contact silicon heterojunction solar cells with solution-processed TiO2 as the efficient electron selective layer

Fengchao Li, Zongheng Sun, Yurong Zhou*, Qi Wang, Qunfang Zhang, Gangqiang Dong, Fengzhen Liu, Zhenjun Fan, Zhenghao Liu, Zhengxiong Cai, Yuqin Zhou, Donghong Yu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

22 Citations (Scopus)

Abstract

Lithography-free interdigitated back-contact silicon heterojunction (IBC-SHJ) solar cells with dopant-free metal oxides (TiO2 and MoOx) as the carriers selective transport layers were investigated. Spin-coating and hot-wire reactive-sublimation deposition together with low cost mask technology were used to fabricate the solar cells. Insertion of a SiOx layer with the thickness of about 2.4 nm between the intrinsic amorphous Si (a-Si:H(i)) passivation layer and the spin-coated TiO2 layer greatly improves the solar cell performance due to the enhanced field-effect passivation of the a-Si:H(i)/SiOx/TiO2 layer stack. Efficiency up to 20.24% was achieved on the lithography-free and dopant-free IBC-SHJ devices with a-Si:H(i)/SiOx/TiO2 layer stack as the electron selective transport layer, a-Si:H(i)/MoOx as the hole selective transport layer, and WOx as the antireflection layer. The novel IBC-SHJ solar cells show significant advantages in simplification of the technology and process compared with the IBC-SHJ devices whose back surface pattering and carrier selective layers relied on photolithography and plasma enhanced chemical vapor deposition (PECVD).
Original languageEnglish
Article number110196
JournalSolar Energy Materials & Solar Cells
Volume203
ISSN0927-0248
DOIs
Publication statusPublished - 2019

Keywords

  • Lithography-free
  • Back-contact
  • Dopant-free
  • Heterojunction
  • Passivation

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