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Upconversion-Triggered Charge Separation in Polymer Semiconductors

Title
Upconversion-Triggered Charge Separation in Polymer Semiconductors
Authors
Jang, Yu JinKim, EunahAhn, SeonghyeonChung, KyungwhaKim, JihyeonKim, HeejunWang, HuanLee, JiseokKim, Dong-WookKim, Dong Ha
Ewha Authors
김동하김동욱
SCOPUS Author ID
김동하scopus; 김동욱scopus
Issue Date
2017
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
ISSN
1948-7185JCR Link
Citation
vol. 8, no. 2, pp. 364 - 369
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Upconversion is a unique optical property that is driven by a sequential photon pumping and generation of higher energy photons in a consecutive manner. The efficiency improvement in photovoltaic devices can be achieved when upconverters are integrated since upconverters contribute to the generation of extra photons. Despite numerous experimental studies confirming the relationship, fundamental explanations for a real contribution of upconversion to photovoltaic efficiency are still in demand. In this respect, we suggest a new approach to visualize the upconversion event in terms of surface photovoltage (SPV) by virtue of Kelvin probe force microscopy (KPFM). One of the most conventional polymer semiconductors, poly(3-hexyl thiophene) (P3HT), is employed as a sensitizer to generate charge carriers by upconverted light. KPFM measurements reveal that the light upconversion enabled the formation of charge carriers in P3HT, resulting in large SPV of -54.9 mV. It confirms that the energy transfer from upconverters to P3HT can positively impact the device performance in organic solar cells (OSCs).
DOI
10.1021/acs.jpclett.6b02511
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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