The Role of Alkane Dithiols in Controlling Polymer Crystallization in Small Band Gap Polymer:Fullerene Solar Cells
The Role of Alkane Dithiols in Controlling Polymer Crystallization in Small Band Gap Polymer:Fullerene Solar Cells
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DOI：
10.1002/polb.22244
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发表时间：
2011-05-15
影响因子：
--
通讯作者：
Nelson, Jenny
中科院分区：
文献类型：
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作者：
Agostinelli, Tiziano;Ferenczi, Toby A. M.;Nelson, Jenny
研究了加工过程中添加1，8-辛二硫醇（ODT）对聚[2，6-（4，4-双（2-乙基己基）-4H-环戊二烯并[2，1-B; 3，4-b ']二噻吩）-alt-4，7（2，1，3-苯并噻二唑）]（PCPDTBT）和[6，6]-苯基-C-71丁酸甲酯（[70]PCBM）共混膜微观结构的影响。掠入射X射线衍射和吸收光谱表明，当在溶液相中引入ODT时，PCPDTBT的结晶顺序增加，无论是纯聚合物系统还是与[70] PCBM的共混物。增加的结晶顺序伴随着聚合物中分散性较低的空穴传输，并导致在共混物内更有效地形成分散的富勒烯网络。这有助于光电流产生的增加。然而，从光电压瞬变确定的双分子复合速率在添加ODT时增加，将功率转换效率限制到远低于从PCPDTBT的能级预期的那些值。我们提出了一些解释，这种增加双分子复合的基础上，也可变角光谱椭偏测量。(C)2011 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理49：717-724，2011
The effect of the addition of 1,8-octanedithiol (ODT) during processing on the microstructure of blend films of poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl-C-71 butyric acid methyl ester ([70]PCBM) is studied. Grazing incidence X-ray diffraction and absorption spectroscopy show that the crystalline order of PCPDTBT increases when ODT is introduced in the solution phase either to neat polymer systems or to blends with [70] PCBM. The increased crystalline order is accompanied by less dispersive hole transport in the polymer, and leads to a more efficient formation of a percolating fullerene network within the blend. This contributes to an increase in photocurrent generation. However, the bimolecular recombination rate as determined from photovoltage transients increases upon addition of ODT, limiting the power conversion efficiency to values well below those expected from the energy levels of PCPDTBT. We propose some explanations for this increase in bimolecular recombination, based also on variable angle spectroscopic ellipsometry measurements. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 717-724, 2011