세미나안내

[2015 03 11] 특별세미나 (BK21PLUS) Prof. Han Young Woo

Semi-crystalline Photovoltaic Polymers: Molecular Design and Property Relationship

MSE Graduate Students and Researchers

관리자 | 2015.03.06 19:40 | 조회 3281


Date: 2015. 03. 11 (WED), 15:00 ~ 17:00

Place: RIST Building 3, #3328

Title: Semi-crystalline Photovoltaic Polymers: Molecular Design and Property Relationship

Speaker: Prof. Han Young Woo (Pusan National University)

Host of a Seminar: Prof. Tae-Woo Lee

 

Abstract:

Over the past few decades, polymer solar cells (PSCs) have made a significant progress, showing their potential in low-cost, flexible, lightweight, portable and large-area energy-harvesting devices. Considerable efforts have been dedicated toward the design of new materials, device architectures and processing techniques in order to improve the power conversion efficiency (PCE). To further improve the PCE value, first and foremost, the molecular structure of low bandgap (LBG) polymers should be carefully designed by considering its close relationship with the photovoltaic parameters, including short-circuit current density (JSC), open-circuit voltage (VOC) and fill factor (FF). Here, we present a series of crystalline low bandgap polymers which were designed by considering the backbone planarity, noncovalent intra- and interchain interactions (via H-bonding and dipole-dipole interactions, etc) and solution processibility, leading to highly ordered film morphologies, deep highest occupied molecular orbital (HOMO) level, balanced electron and hole mobilities. The molecular design and resulting morphological, electrical and device properties will be discussed in detail. Devices based on these polymers exhibit outstanding long-term thermal stability at 130 oC for over 200 h and the highest PCE over 9% in a conventional PSC having a single-cell device structure with a ~300 nm thick active layer.

 


Department of Materials Science and Engineering / MSE BK21+





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