Transient photovoltage and dark current analysis on enhanced open-circuit voltage of polymer solar cells with hole blocking TiO2 nanoparticle interfacial layer

Youn Su Kim, Taehee Kim, Bongsoo Kim, Doh Kwon Lee, Honggon Kim, Byeong Kwon Ju, Kyungkon Kim

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The open-circuit voltage of bulk heterojunction polymer solar cells utilizing 1,8-diiodooctane (DIO) as a processing additive was greatly improved by using an organic layer coated TiO2 nanoparticle interfacial layer inserted between the active layer and the Al electrode. The transient photovoltage measurement revealed that there was significant non-geminate recombination at the DIO-processed active layer/Al electrode interface. Reduced open-circuit voltage (VOC) of the photovoltaic devices and high water contact angle of the DIO-processed active layer showed that the DIO-processed active layer has an undesirable surface composition for the electron collection. The organic layer coated TiO2 nanoparticle interfacial layer effectively prevented the non-geminate recombination at the active layer/Al interface. As a result, we were able to significantly improve the VOC and power conversion efficiency from 0.46 V and 2.13% to 0.62 V and 3.95%, respectively.

Original languageEnglish
Pages (from-to)1749-1754
Number of pages6
JournalOrganic Electronics
Volume14
Issue number7
DOIs
Publication statusPublished - 2013 Jul

Bibliographical note

Funding Information:
This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2008-2000092), by the Global Frontier R&D Program on Center for Multiscale Energy System funded by the National Research Foundation under the Ministry of Education and by KRCF (Korea Research Council of Fundamental Science &Science and Technology and Technology) and KIST (Korea Institute of Science & Technology) for‘‘NAP (National Agenda Project) program”.

Keywords

  • Polymer solar cells
  • Processing additive
  • Transient photovoltage
  • Vertical phase separation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry
  • General Chemistry
  • Electrical and Electronic Engineering
  • Biomaterials

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