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  • 09월 12일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제110회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A Benzo[1,2-b:4,5-b’]dithiophene Derivative with Deep HOMO level and High Fill Factor: Application for Organic Photovoltaic Cells and Organic Semiconductors

등록일
2012년 9월 5일 15시 56분 30초
접수번호
1717
발표코드
MAT.P-1384 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
황문찬, 박소민, 한승훈1, 김철영1, 유승진1, 김윤희1, 권순기2
경상대학교 고분자공학과, Korea
1경상대학교 화학과, Korea
2경상대학교 나노신소재공학부, Korea
We have used stille coupling polymerization to synthesize a series of new crystalline deep HOMO level polymers PhBDT-TPD, PhBDT-BT and PhBDT-DTBT constituting mainly electron-withdrawing thieno[3,4-c]pyrrole-4,6-dione (TPD), 4,7-dibromobenzo [c] [1,2,5] thiadiazole(BT), 4,7-bis(5-bromothiophen -2-yl)benzo[c][1,2,5]thiadiazole (DTBT) units in conjugation with electron-rich 4,8-bis(2-octyldodecyloxyphenyl)-benzo-[1,2-b:4,5-b']dithiophene (PhBDT) moieties. All of these polymers exhibited low-lying highest occupied molecular orbital (HOMO, -5.43 ~ -5.66 eV) for high open circuit voltage(Voc) and Band gaps of PhBDT-TPD, PhBDT-BT and PhBDT-DTBT were tuned from 1.86, 1.72 and 1.69 eV, respectively. As a result, bulk heterojunction photovoltaic devices derived from these polymers and fullerenes provided open-circuit voltages (Voc) as high as 0.73 ~ 1.02 V. In particular, the photovoltaic device comprising the PhBDT-DTBT / PC70BM (1:2) blend system exhibited excellent performance with a value of Voc of 0.73 V, a short-circuit current density (Jsc) of 7.06 mA/cm2, a fill factor (FF) of 0.67, and a promising power conversion efficiency (PCE) of 3.5%. In addition, OTFT device also exhibited performance with value of hole mobility 4.7 × 10-2 cm2 V-1s-1. These results are proved by XRD and AFM. PhBDT-DTBT of the thiophene bridge provides enough space for the bulky alkoxyphenyl side chains interdigitation and increases the planarity with enhanced π-π stacking, so, It showed good performances when applied in organic photovoltaic and semiconductor.

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