Microphase‐Separated Donor–Acceptor Diblock Copolymers: Influence of HOMO Energy Levels and Morphology on Polymer Solar Cells
Microphase‐Separated Donor–Acceptor Diblock Copolymers: Influence of HOMO Energy Levels and Morphology on Polymer Solar Cells
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DOI：
10.1002/adfm.200600634
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发表时间：
2007-06
影响因子：
19
通讯作者：
M. Sommer;Stefan M. Lindner;M. Thelakkat
中科院分区：
文献类型：
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作者：
M. Sommer;Stefan M. Lindner;M. Thelakkat
报道了一种新型半导体给体-受体(D-A)嵌段共聚物的合成方法。该共聚物含有空穴传输、电子传输和光吸收的功能部分。代表给体的第一嵌段由取代的三苯胺((poly(bis(4‐methoxyphenyl)‐4′‐vinylphenylamine)，)或取代的四苯基联苯胺(N′‐bis(4‐methoxyphenyl)‐N‐phenyl‐N′‐4‐vinylphenyl‐(1，1′‐biphenyl)‐4，4′‐diamine)，)组成。第二个嵌段由通过柔性间隔物连接到聚丙烯酸酯主链(PPerAcr)上的二苯二亚胺侧基组成。该阻挡块负责可见光范围内的吸收和电子传输特性。用循环伏安法(CV)研究了两嵌段共聚物PvDMTPA-b-PPerAcr和PvDMTPD-b-PPerAcr的电化学性质，并用透射电子显微镜(TEM)研究了它们的形态。所有两嵌段共聚物都表现出微相分离的结构域，其形式为嵌入空穴-导体基质中的二苯二亚胺制成的线状或蠕虫状结构。在单有源层有机太阳电池中，PvDMTPD-b-PPerAcr的功率转换效率(η=0.26%，短路电流(ISc)为1.21 mA·cm-2)比其类似物PvTPA-b-PPerAcr(η=0.065%，ISc=0.23 mA·cm-2)提高了4倍，效率提高了5倍(η=0.32%，ISc=0.23 mA·cm-2)。
The synthesis of novel semiconducting donor–acceptor (D–A) diblock copolymers by means of nitroxide‐mediated polymerization (NMP) is reported. The copolymers contain functional moieties for hole transport, electron transport, and light absorption. The first block, representing the donor, is made up of either substituted triphenylamines (poly(bis(4‐methoxyphenyl)‐4′‐vinylphenylamine), PvDMTPA) or substituted tetraphenylbenzidines (poly(N,N′‐bis(4‐methoxyphenyl)‐N‐phenyl‐N′‐4‐vinylphenyl‐(1,1′‐biphenyl)‐4,4′‐diamine), PvDMTPD). The second block consists of perylene diimide side groups attached to a polyacrylate backbone (PPerAcr) via a flexible spacer. This block is responsible for absorption in the visible range and for electron‐transport properties. The electrochemical properties of these fully functionalized diblock copolymers, PvDMTPA‐b‐PPerAcr and PvDMTPD‐b‐PPerAcr, are investigated by cyclic voltammetry (CV), and their morphology is investigated by transmission electron microscopy (TEM). All diblock copolymers exhibit microphase‐separated domains in the form of either wire‐ or wormlike structures made of perylene diimide embedded in a hole‐conductor matrix. In single‐active‐layer organic solar cells, PvDMTPD‐b‐PPerAcr reveals a fourfold improvement in power conversion efficiency (η = 0.26 %, short‐circuit current (ISC) 1.21 mA cm–2), and PvDMTPA‐b‐PPerAcr a fivefold increased efficiency (η = 0.32 %, ISC = 1.14 mA cm–2) compared with its unsubstituted analogue PvTPA‐b‐PPerAcr (η = 0.065 %, ISC = 0.23 mA cm–2).