Electrode, nanostructure, interface and process engineering towards high performance flexible polymer solar cells = 전극, 나노구조체, 계면 및 프로세스 엔지니어링에 의한 플렉시블 고분자 태양전지의 성능향상에 관한 연구

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Considerable attention has been devoted to polymer solar cells (PSCS) as potential next-generation solar energy-harvesting devices, owing to their low manufacturing cost and the possibility of fabricating PSCs in lightweight flexible plastic. In spite of the intensive research efforts in this field, the performance of PSCs is still far away from commercialization level requirements, primarily because the short exciton diffusion length of organic semiconductor limits the active layer thickness for efficient light absorption. Although polymer/fullerene bulk heterojunction (BHJ) system has been employed to increase the number of interfaces for facilitating charge separation, the low carrier mobilities and tortuous transport paths in these structure increase recombina-tion losses in thicker devices. Therefore, it is important to develop efficient light-trapping structures that can maximize light absorption, and at the same time ensure the resulting carrier can be efficiently collected by elec-trodes, with minimum recombination loss.In chapter 2, we optically and electrically designed and experimentally demonstrated a highly efficient top-illuminated flexible polymer solar cells on the nano-patterned polyethylene terephthalate (PET) substrates with 3D nano-patterned microresonant cavity. To enable optimum carrier transport in the dielec-tric/metal/dielectric (DMD) transparent electrode-based solar cells through a nanopatterned micro resonant cavi-ty, we precisely controlled the thickness of the photoactive and transporting layers. Then, the optical-field distri-bution inside the photoactive layer was tuned by the out-of-cell capping layer’s thickness and nanopattern. Fi-nally, the PET substrates under the PS mask was etched by reactive ion etching with a line-shaped pattern 50nm in height and 500nm in width. Then, each layer of device was conformally coated onto the nanpatterned PET substrates, confining the incident light within active layer. The resulting 3D nano...
Advisors
Jung, Hee-Taeresearcher정희태
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
591779/325007  / 020105248
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2014.8, [ viii, 64pp ]

Keywords

polymer solar cell; 그래핀; 계면; 나노구조체; 마이크로 공진 캐비티; 유기태양전지; resonant; nanostructure; interface; graphene

URI
http://hdl.handle.net/10203/196404
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=591779&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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