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  • 09월 08일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 High performance of PbSe/PbS core/shell quantum dot heterojunction solar cells: Short circuit current enhancement without loss of open circuit voltage by shell thickness control

2015년 8월 27일 16시 48분 30초
ELEC.O-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 09시 : 00분
전기화학 - Oral Presentation for Young Electrochemists
저자 및
최혜경, 정소희1,*
과학기술연합대학원대학교(UST) 나노메카트로닉스학과, Korea
1한국기계연구원 나노기계연구본부, Korea
A noticeable photoconversion efficiency of colloidal quantum dot solar cell has been achieved recently, more than 9%. Still, low open circuit voltage limits further enhancement which is attributed mainly to the deep traps associated with defects from incomplete surface passivation. Here, we fabricate PbSe/PbS core/shell quantum dot-based heterojunction solar cell with precise shell thickness control. When PbS shell thickness increases, the short circuit current density increases from 6.4 to 11.8 mA/cm2 and the fill factor enhances from 30 to 49%. Contrary to expectations, the open circuit voltage remains unchanged at 0.46 V. We reveal that the core material influences on the energy levels involved in the junction in the core/shell materials confirmed by ultraviolet photoelectron spectroscopy (UPS) and UV-Vis-NIR absorption spectroscopy thereby mitigating the trade-off relationship between open circuit voltage and short circuit current density. Finally, under optimized condition, the PbSe core with 0.9-nm-thick shell yielded the power conversion efficiency of 6.5% under AM 1.5.