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Molecular design and property relationship for ideal photovoltaic polymers
우한영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
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. We present a series of crystalline low bandgap polymers which were designed by considering the backbone planarity, noncovalent intra- and interchain interactions 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 ℃ 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.