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Synthesis of Conductive Conjugated Polyelectrolytes as Hole-transporting Layer for Use in Organic Solar Cells

Synthesis of Conductive Conjugated Polyelectrolytes as Hole-transporting Layer for Use in Organic Solar Cells
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교육대학원 화학교육전공
이화여자대학교 교육대학원
Generally, PEDOT:PSS have been used as hole-transporting material in conventional OPV structure. PEDOT: PSS, however, has disadvantages such as anisotropic electric conductivity, low work function and acidity which are not suitable as HTL. Studies on conjugated polyelectrolytes(CPEs) composed of conjugated backbone and polar pendant as alternatives to PEDOT: PSS are actively under way. In this paper, we have developed novel hole transporting CPEs (H-CPEs) with appropriate WF and high conductivity consists of thiophene and benzothiadiazole as conjugated backbones and sulfonate group as polar pendant group. Especially, thiophene and benzothiadiazole were copolymerized in consideration of solubility in water, and the characteristics of the polymer according to the proportion of benzothiadiazole were confirmed. The synthesized polymers were self - doped after the dialysis purification process, and the degree of self - doping increased with increasing the ratio of benzothiadiazole. The developed H-CPEs had a transmittance of about 80% and was suitable as a hole transport layer. In addition, it was confirmed that the work function value was higher than that of the previously developed Ph-T and PEDOT:PSS. The device by using H-CPEs had significantly increased JSC parameters, resulting to an improved efficiency of 8.82%.;본 논문에서는 벌크이종접합 구조를 가지는 유기태양전지의 성능 향상을 위한 정공수송층에 대해 연구를 진행하였다. 노멀 구조의 유기태양전지에서 정공수송층으로 주로 사용되는 PEDOT:PSS는 이등방성의 전도도, 낮은 일함수와 전도도, 산성 등의 단점을 가지고 있다. 이러한 PEDOT:PSS의 대체 물질로써 공액고분자(CPEs)가 많이 연구되고 있지만 여전히 낮은 WF와 낮은 전도도를 극복하지 못하고 있다. 따라서 본 연구에서는 싸이오펜과 벤조싸이아다이아졸을 콘쥬게이트 백본으로 하고 썰포네이트 그룹을 극성 펜던트로 가지며 적절한 WF를 가지는 새로운 정공수송공액고분자(H-CPEs)를 개발하였다. 합성된 고분자는 투석정제과정 후에 자기 도핑되었고, 특히 벤조싸이아다이아졸의 비율이 높을수록 자기 도핑의 정도도 증가하였다. 개발된 H-CPE의 투과도는 80% 내외로 정공수송층으로 적합한 특성을 가지고 있었으며, PEDOT:PSS와 기존에 개발된 Ph-T보다 높은 일함수 값을 가지는 것이 확인되었다. H-CPE를 정공수송층으로 사용하여 유기태양전지를 제작한 결과, Jsc 값이 증가하면서 결과적으로 효율 향상이라는 결과를 가져왔다.
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