Enhanced ferroelectric photovoltaic effect in semiconducting single-wall carbon nanotube/BiFeO3 heterostructures enabled by wide-range light absorption and efficient charge separation

Hojin Lee, Hyo Sun Kim, Oh Yeong Gong, Jun Young Kim, Jin Hong Kim, Jin Sik Choi, Hyun Suk Jung, Jun Young Park, Dong Hoe Kim, Young Soo Seo, Taekjib Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The interfacial electronic band structures of photovoltaic heterostructure devices greatly affect their light absorption and charge-transport properties and thus their photovoltaic performance. In this work, we report an enhanced ferroelectric photovoltaic effect in a semiconducting single-walled carbon nanotube (S-SWCNTs)/ferroelectric BiFeO3 (BFO) heterostructure. A wide range of light absorption was possible in this structure owing to the low bandgaps of the S-SWCNTs (0.2-2.1 eV) and BFO (2.2-2.7 eV). The heterostructure also enabled efficient charge separation owing to the strong built-in electric field resulting from the synergic effect of the formation of p-f-n junctions (p-type S-SWCNTs/ferroelectric (f) BFO/n-type Nb:SrTiO3) and the introduction of a polarization-mediated internal field in the ferroelectric BFO layer. Compared with a single-layer device (Pt/BFO/Nb:SrTiO3), the heterostructure device (Pt/S-SWCNTs/BFO/Nb:SrTiO3) exhibited substantial enhancement of the photovoltaic performance. The open-circuit photovoltage and short-circuit photocurrent density reached up to 0.23 V and -7.52 mA cm-2 (corresponding to a photo-conversion efficiency of 4.40%) under one-sun illumination, respectively, after optimization of the ferroelectric layer thickness and appropriate interfacial band alignment. Moreover, by applying switchable electric polarization, this heterostructure could be tuned, enabling the development of controllable photovoltaic devices. Our findings demonstrate that the synergistic integration of materials with different functionalities is a promising approach for the design of photovoltaic devices with tunable performance.

Original languageEnglish
Pages (from-to)10377-10385
Number of pages9
JournalJournal of Materials Chemistry A
Volume8
Issue number20
DOIs
Publication statusPublished - 2020 May 28
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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