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박막모폴로지와 전하 재결합이 다이케토피롤로피롤 기반 고분자 근적외선 포토디텍터의 성능에 미치는 영향에 대한 연구
- Alternative Title
- Dae Woon Lee
- Author(s)
- 이대운
- Alternative Author(s)
- Dae Woon Lee
- Advisor
- 김종현
- Department
- 일반대학원 분자과학기술학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2019-02
- Language
- kor
- Alternative Abstract
- Near-infrared (NIR) photodetectors sensitive to 860 nm were fabricated through a solution process with two different conjugated polymers (CPs) sharing a similar conjugated backbone consisting of the diketopyrrolopyrrole (DPP) moiety. The two CPs had comparable conjugated nature, but their detection capability was significantly distinguished by the applied linker units, thiophene for PDPP-T and fluorinated thiophene for PDPP-FBT. First, it has been revealed that employing additive during active film preparation is beneficial to achieve optimum film morphology for both CPs, which can suppress dark current and provide enhanced detectivity. In addition, when a highly electronegative fluorine atom that induces a surface dipole was introduced into the conjugated skeleton, it has been clearly demonstrated by transient photovoltage measurement that the charge recombination time is lengthened, which implies the increase of possibility of charge extraction in actual device through reducing the charge recombination. Thus, PDPP-FBT exhibited higher external quantum efficiency and responsivity overall wavelength. Our results indicate that the management of both film morphology and surface dipole of CP are evenly important to achieve high detectivity and responsivity in organic NIR photodetectors.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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