Side chain fluorination approach for enhancing efficiency of all polymer solar cells = 곁사슬 플루오린화 접근법을 통한 고효율의 전 고분자 태양전지 구현

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A new series of conjugated polymer donors (non-fluorinated P1 and fluorinated P2) were synthesized from an electron-rich benzodithiophene (BDT)-derived moiety in conjugation with electron-deficient 1,3-bis(4-octylthien-2-yl)-5-(2-ethylhexyl)thieno[3,4-c]pyrrole-4,6-dione unit via microwave assisted Stille polymerization, with a view to demonstrating fluorination effects of p-type polymers. We introduced the fluorine atoms into the 2D-conjugated side chains (alkoxyphenylthiophene) of the BDT unit instead of direct substitution into the polymer backbones to fine-tune the polymer properties, such as energy levels and interfacial interaction, without signifi-cantly affecting other polymer properties. As the fluorination of the polymers, the power conversion efficiency increased remarkably from 2.93% $(V_{OC} : 0.88 V, J_{SC} : 7.41 mA \dot cm^{-2}, and FF: 0.45)$ for the P1-based all-PSCs to 7.13% $(V_{OC} : 0.94 V, J_{SC} : 12.22 mA \dot cm^{-2}, and FF: 0.62)$ for the P2-based all-PSCs. This significant enhancement is achieved by synergistic improvements in open-circuit voltage, charge generation, and charge transport, as fluorination of the donor polymer optimized the band alignment and film morphology.
Advisors
Kim, Bum Joonresearcher김범준researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2016.8 ,[v, 56 p. :]

Keywords

All Polymer Solar Cells (all-PSCs); High efficiency; Fluorination; Polymer donor; Charge transport; 전 고분자 태양전지; 고효율; 플루오리네이션; 고분자 전자 주개; 에너지 레벨

URI
http://hdl.handle.net/10203/221483
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663381&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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