High performance inverted polymer solar cells using ultrathin atomic layer deposited TiO2 films

Hyun Soo Cho, Nara Shin, Kyungkon Kim, Bong Soo Kim, Do Heyoung Kim

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Abstract Photovoltaic properties of inverted type polymer solar cells (PSCs) using ultrathin TiO2 layers as an adjuvant electron collecting layer were investigated. To prepare the ultrathin (2.5 nm) TiO2 layers on top of TiO2 nanoparticles, atomic layer deposition (ALD) process was conducted at 125, 175, and 200 C. The addition of ALD TiO2 on nanoparticulated TiO2 effectively enhanced the photovoltaic performances of inverted organic solar cells. The inverted PSC device with the thin 200 C-ALD TiO2 layers showed the highest power conversion efficiency of 3.50%, which is an enhancement of approximately 30% compared to the cells without the ALD TiO2 layer (PCE = 2.72%). This work demonstrates that the ALD process plays a critical role in the enhancement of electron extraction efficiency with treating the surface defects of the TiO2 nanoparticles.

Original languageEnglish
Article number14984
Pages (from-to)31-34
Number of pages4
JournalSynthetic Metals
StatePublished - 14 Jun 2015

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea, funded by the Ministry of Education, Science and Technology, Korea (NRF-2013R1A1A4A01013486).

Publisher Copyright:
© 2015. Elsevier B.V.


  • Atomic layer deposition
  • Electron extraction layer
  • Inverted photovoltaic devices
  • Power conversion efficiency
  • Titanium nanoparticles


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