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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Donor-Acceptor Random configuration of semiconducting polymer for efficient, flexible and green-solvent processable solar cells

2019년 8월 22일 14시 23분 28초
POLY.P-30 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (금요일) 11:00~12:30
Polymer Chemistry
저자 및
Daehwan Lee, Taewan Kim, Hae Un Kim, Hyuntae Choi, Sungjin Park, Seyeong Lim, Taiho Park*
Department of Chemical Engineering, Pohang University of Science and Technology, Korea
Morphologies and optoelectronic/mechanical properties of semiconducting polymers are significantly affected by their configurations. In this study, thiophene units are introduced into the backbone structure of a semiconducting polymer in either a regular (PffBT-T4) or a random (PffBT-RT4) manner to determine whether the resulting semiconducting polymers are suitable for developing efficient polymer solar cells. The energy levels of both polymers are highly similar because they share the same ratio of sub-units in their backbones however, PffBT-RT4 has lower crystallinity than PffBT-T4 due to its random configuration. Microstructural analyses indicate that PffBT-RT4 exhibits a shorter p–p stacking distance than PffBT-T4. Since short p–p stacking distance benefits interchain charge transport, PffBT-RT4 shows higher space-charge-limited current mobility, and PffBT-RT4 solar cells exhibit higher power conversion efficiency (PCE; 8.84%) than their PffBT-T4 counterparts (7.25%). In addition, PffBT-RT4 solar cells with active layers, prepared using a green solvent without any additive, show an encouraging PCE of 7.23%. Moreover, flexible solar cells based on PffBT-RT4 are much more stable during bending cycles than PffBT-T4 flexible solar cells. Therefore, this study demonstrates that the random configuration approach is a promising design strategy to realize semiconducting polymers for efficient, green-solventprocessable flexible polymer solar cells