Solar cell based on vertical graphene nano hills directly grown on silicon

Malik Abdul Rehman, Sanjib Baran Roy, Dham Gwak, Imtisal Akhtar, Naila Nasir, Sunil Kumar, Muhammad Farooq Khan, Kwang Heo, Seung Hyun Chun, Yongho Seo

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We demonstrate a solar cell application based on vertical graphene nano hills (VGNH) directly grown without using a catalyst. The photovoltaic device based on VGNH grown on top of interfacial layer Al2O3 is compared with that on top of bare silicon by critically analyzing its electrical properties. The role of the interfacial layer is to minimize surface recombination and enhance its built-in potential. Our key process is simple to fabricate large-area devices, avoiding an unreliable transfer process. In addition, the thickness of VGNH is optimized and the surface texturing of silicon is performed to overcome the crucial problem of the high reflectivity of silicon. A low reflectivity of thick layers of VGNH is achieved with low series resistance despite of the vertical structure, which is beneficial for high photocurrent. A higher work function of VGNH ∼4.7 eV is measured by KPFM. The conversion efficiency of 10.97% is achieved with an active area of 0.9 cm2 by co-doping with PEDOT: PSS and inorganic acid HNO3. Moreover, the photo-responsivity of the VGNH-based device is estimated as 1.196 AW-1 under deep ultraviolet light.

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalCarbon
Volume164
DOIs
StatePublished - 30 Aug 2020

Bibliographical note

Publisher Copyright:
© 2020 The Author(s)

Keywords

  • Directly grown graphene
  • Graphene co-doping
  • Graphene nano hills
  • Schottky junction
  • Solar cell
  • Textured substrate.
  • Vertical graphene

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