设计和合成共轭材料的太阳能电池
讲座名称：
设计和合成共轭材料的太阳能电池
讲座时间：
2016-06-24
讲座人：
Mats R. Andersson
形式：
校区：
兴庆校区
实践学分：
讲座内容：
讲座题目：Design and synthesis of conjugated materials for solar cells
讲座地点：材料科学与工程学院会议室01号
讲座人： Prof. Mats R. Andersson
讲座时间： 2016.06.24 10:00 a.m
Abstract:
Polymer solar cells have gained considerable interest during the last decades. The most promising active layer material comprises so-called bulk-heterojunction blends of a donor polymer that is finely mixed with a fullerene acceptor. The photovoltaic performance has increased rapidly over the last years with power conversion efficiencies now exceeding 11% for lab-scale single-junction devices. One advantage of polymer solar cells is the possibility to use roll-to-roll coating techniques for large-scale device production. However, several issues must be resolved before the efficiencies of lab-scale devices can be reproduced on large scale.
The development of high efficiency polymer solar cells is a challenging research task and our efforts have, during several years, been concentrated on synthesizing and evaluating new materials. Through the last years considerable effort has been put into decreasing the bandgap of the conjugated polymers with the objective to extend the absorption to longer wavelengths. Thereby, a larger part of the solar spectrum is covered. Introduction of donor-acceptor segments in the polymer backbone, creating internal push pull systems, is a method we have used to prepare a number of polymers with reduced bandgap.
Recently we synthesized a blue donor-acceptor copolymer called TQ-1, which in hero cells shows a maximum efficiency around 6%. This polymer simply consists of thiophenes alternating with substituted quinoxaline units and is easily synthesized in only a few steps. To increase the thermal stability of the active material different methods to stabilize the morphology will be described. In the search for new high performing polymers hero cells showing efficiencies above 7% will also be presented.
In our experience the interlayer materials that combine conjugated functionalities with amine derivatives give unstable modification of the electrode work function under ambient conditions, whereas stability is a prerequisite for a large scale roll-to-roll production process. Thus, it would be desirable to develop a method that permits to mitigate the poor stability of interlayer materials. In this work we establish that fullerene mixtures can be used to simultaneously achieve both interlayer modification of the cathode and improved thermal stability of a polymer:fullerene bulk-heterojunction blend.
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