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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a ∼300 nm thick conventional single-cell device

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Title
Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a ∼300 nm thick conventional single-cell device
Author
Nguyen, Thanh LuanChoi, HyosungKo, SeojinUddin, Mohammad AfsarWalker, BrightYum, SeungjibJeong, J.E.Yun, M.H.Shin, Tae JooHwang, SeongyeonKim, Jin YoungWoo, Hanyoung
Issue Date
2014-09
Publisher
ROYAL SOC CHEMISTRY
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v.7, no.9, pp.3040 - 3051
Abstract
We report a series of semi-crystalline, low band gap (LBG) polymers and demonstrate the fabrication of highly efficient polymer solar cells (PSCs) in a thick single-cell architecture. The devices achieve a power conversion efficiency (PCE) of over 7% without any post-treatment (annealing, solvent additive, etc.) and outstanding long-term thermal stability for 200 h at 130 °C. These excellent characteristics are closely related to the molecular structures where intra- and/or intermolecular noncovalent hydrogen bonds and dipole-dipole interactions assure strong interchain interactions without losing solution processability. The semi-crystalline polymers form a well-distributed nano-fibrillar networked morphology with PC70BM with balanced hole and electron mobilities (a h/e mobility ratio of 1-2) and tight interchain packing (a π-π stacking distance of 3.57-3.59 A) in the blend films. Furthermore, the device optimization with a processing additive and methanol treatment improves efficiencies up to 9.39% in a ∼300 nm thick conventional single-cell device structure. The thick active layer in the PPDT2FBT:PC 70BM device attenuates incident light almost completely without damage in the fill factor (0.71-0.73), showing a high short-circuit current density of 15.7-16.3 mA cm-2. Notably, PPDT2FBT showed negligible changes in the carrier mobility even at ∼1 μm film thickness.
URI
https://scholarworks.unist.ac.kr/handle/201301/5602
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84906243487
DOI
10.1039/c4ee01529k
ISSN
1754-5692
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ECHE_Journal Papers
SE_Journal Papers
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