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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Control of Charge Dynamics via Use of Nonionic Phosphonate Chains and Their Effectiveness for Inverted Structure Solar Cells

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Title
Control of Charge Dynamics via Use of Nonionic Phosphonate Chains and Their Effectiveness for Inverted Structure Solar Cells
Author
Kim, GyoungsikSong, SeyeongLee, JunghoKim, TaehyoLee, Tack HoWalker, BrightKim, Jin YoungYang, Changduk
Issue Date
2015-09
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.5, no.18, pp.1500844
Abstract
Considering that a high compatibility at hybrid organic/inorganic interfaces can be achieved using polar and hydrophilic functionalities, this approach is used to improve inverted polymer solar cell performance by introducing nonionic phosphonate side chains (at 0%, 5%, 15%, and 30% substitution levels) into a series of isoindigo-based polymers (PIIGDT-Pn). This approach led to approximate to 20% improvement in power conversion efficiency compared to a nonmodified control polymer, via an increased short-circuit current (J(SC)). This enhancement is believed to stem from reduced nongerminate recombination and improved charge carried extraction when the level of phosphonate substitution is optimized. These results are substantiated by a combination of detailed electrical measurements including space-charged limited current modeling, light intensity-dependent photocurrent (J(ph)) analysis, and morphological studies (grazing-incidence wide-angle X-ray scattering and atomic force microscopy). This is the first practical report demonstrating the use of nonionic polar side chains to control charge carrier dynamics in an existing photovoltaic polymer structure. It is envisioned that this simple strategy may be applied to other material systems and yield new materials with the potential for even higher performance
URI
https://scholarworks.unist.ac.kr/handle/201301/17563
URL
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201500844/abstract?systemMessage=Wiley+Online+Library+will+be+disrupted+on+24th+October+2015+at+10%3A00-10%3A30+BST+%2F+05%3A00-05%3A30+EDT+%2F+17%3A00-17%3A30++SGT++for+essential+maintenance.++Apologies+for+the+inconvenience
DOI
10.1002/aenm.201500844
ISSN
1614-6832
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