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제107회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Solution-Processable Crystalline Small Molecules for High Performance Photovoltaic Cells

2011년 2월 16일 03시 06분 31초
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목 16시 : 50분
무기화학 - Inorganic/Material Science in Energy Applications I
저자 및
한국과학기술연구원 태양전지센터, Korea
Progress in organic photovoltaics (OPVs) requires significant advances in the areas of material design and synthesis, film processing, and morphology control, as well as device architecture. One of the most important breakthroughs in OPVs is the introduction of the bulk heterojunction (BHJ) device structure, in which the photoactive thin film consists of a blend of electron donors and acceptors. To date, solution-processed BHJ photovoltaic cells have achieved a power conversion efficiency (PCE) of up to 8%, using various semiconducting polymers as the electron donor and fullerene derivatives as the electron acceptor. In contrast to polymeric systems that intrinsically display large structural variations in molecular weight, polydispersity, and regioregularity, conjugated small molecules and oligomers possess well-defined structures that are relatively easy to modify and purify. In addition, small molecules and oligomers show a strong tendency to self-assemble into ordered crystalline domains with superior charge transport properties and favorable nanoscale phase separation may be achieved via self-assembly of donor and acceptor molecules during solution processing, affording PCEs that have evolved from 1% to 4.4%. Generally, device efficiencies have been limited by issues including poor overlap with the solar spectrum, low molar absorptivity, and low charge mobility. Therefore, the development of new molecular donors with desirable absorption and charge transport properties is important to understand the variables that control the device performance. Here we present our efforts in exploring a series of small molecules for high performance solar cells. Our work demonstrates that solar cell properties are strongly correlated with chemical structures.