High performance inverted polymer solar cells using ultrathin atomic layer deposited TiO<inf>2</inf> films
- 주제(키워드) Atomic layer deposition , Electron extraction layer , Inverted photovoltaic devices , Power conversion efficiency , Titanium nanoparticles
- 등재 SCOPUS
- 발행기관 Elsevier Ltd
- 발행년도 2015
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000117817
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.synthmet.2015.06.001
초록/요약
Abstract Photovoltaic properties of inverted type polymer solar cells (PSCs) using ultrathin TiO<inf>2</inf> layers as an adjuvant electron collecting layer were investigated. To prepare the ultrathin (2.5 nm) TiO<inf>2</inf> layers on top of TiO<inf>2</inf> nanoparticles, atomic layer deposition (ALD) process was conducted at 125, 175, and 200 C. The addition of ALD TiO<inf>2</inf> on nanoparticulated TiO<inf>2</inf> effectively enhanced the photovoltaic performances of inverted organic solar cells. The inverted PSC device with the thin 200 C-ALD TiO<inf>2</inf> layers showed the highest power conversion efficiency of 3.50%, which is an enhancement of approximately 30% compared to the cells without the ALD TiO<inf>2</inf> 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 TiO<inf>2</inf> nanoparticles. © 2015. Elsevier B.V.
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