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  • 02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Hierarchical Homogeneous TiO2 Structures Composed of TiO2 Nanoparticles and Nanotubes for highly efficient dye-sensitized solar cells

등록일
2015년 2월 12일 16시 55분 33초
접수번호
1211
발표코드
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발표시간
금 11시 : 00분
발표형식
구두발표
발표분야
고분자화학 - General Oral Presentation
저자 및
공동저자
최종민, 박태호*
포항공과대학교(POSTECH) 화학공학과, Korea
We prepared well-defined hierarchical structures comprising doubly open-ended TiO2 nanotube (NT) arrays decorated with various layers of small-sized TiO2 nanoparticles (NPs) to identify the electron collection mechanisms in homogeneous hybrid structures. We found that competitive electron transport pathways, direct transport through the NT and randomized transport through the NPs, are present in the homogeneous hybrid structures. Photoinduced electrons generated at the small-sized TiO2 NPs directly connected with TiO2 NTs dominantly traveled to the NTs. With an increasing number of TiO2 NP layers, photoinduced electrons are randomly transported through the TiO2 NP layers. Enhanced light harvesting and efficient charge collection (∼95%) caused by the increased amounts of dye loading and the direct transport through the NT, respectively, are achieved in a structure with ∼1.4 layers of few-nanometer-sized TiO2 NPs, resulting in a power conversion efficiency of 11.3% with a JSC value (22.9 mA/cm2) close to the theoretical value (∼26 mA/cm2) of a N719-based dye-sensitized solar cell.

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