Selectively patterned TiO2 nanorods as electron transport pathway for high performance perovskite solar cells

Daihong Huh, Kyoung Suk Oh, Minjin Kim, Hak Jong Choi, Dong Suk Kim, Heon Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Organic-inorganic hybrid perovskite solar cells (PSCs) are attracting tremendous attention for new-generation photovoltaic devices because of their excellent power conversion efficiency and simple fabrication process. One of the various approaches to increase the efficiency of PSCs is to change the material or structure of the carrier transport layer. Here, optically long and electrically short structural concept is proposed to enhance the characteristics of a PSC by employing selectively grown single crystalline TiO2 nanorods. The approach has the merit of increasing the electron-hole separation effectively and enables a thicker active layer to be coated without electrical loss by using TiO2 nanorods as an electron pathway. Moreover, selectively grown TiO2 nanorods increase the optical path of the incident light via scattering effects and enable a smooth coating of the active layer. Nanoimprint lithography and hydrothermal growth were employed to fabricate selectively grown TiO2 nanorod substrates. The fabricated solar cell exhibits an efficiency of 19.86% with a current density, open-circuit voltage, and fill factor of 23.13 mA/cm2, 1.120 V, and 76.69%, respectively. Time-resolved photoluminescence, ultraviolet-visible (UV–Vis) spectroscopy, and the incident photon to current efficiency (IPCE) analysis were conducted to understand the factors responsible for the improvement in characteristics of the fabricated PSCs.[Figure not available: see fulltext.].

Original languageEnglish
JournalNano Research
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Nanorods
Nanoimprint lithography
Carrier transport
Electrons
Ultraviolet visible spectroscopy
Open circuit voltage
Conversion efficiency
Solar cells
Photoluminescence
Current density
Photons
Scattering
Crystalline materials
Fabrication
Coatings
Perovskite solar cells
Electron Transport
Substrates

Keywords

  • nanoimprint lithography
  • patterned TiO nanorods
  • perovskite solar cells

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

Selectively patterned TiO2 nanorods as electron transport pathway for high performance perovskite solar cells. / Huh, Daihong; Oh, Kyoung Suk; Kim, Minjin; Choi, Hak Jong; Kim, Dong Suk; Lee, Heon.

In: Nano Research, 01.01.2018.

Research output: Contribution to journalArticle

Huh, Daihong ; Oh, Kyoung Suk ; Kim, Minjin ; Choi, Hak Jong ; Kim, Dong Suk ; Lee, Heon. / Selectively patterned TiO2 nanorods as electron transport pathway for high performance perovskite solar cells. In: Nano Research. 2018.
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