An Alkylated Indacenodithieno[3,2-b]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses
An Alkylated Indacenodithieno[3,2-b]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses
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DOI：
10.1002/adma.201705209
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发表时间：
2018-02-22
影响因子：
29.4
通讯作者：
Heeney, Martin
中科院分区：
文献类型：
--
作者：
Fei, Zhuping;Eisner, Flurin D.;Heeney, Martin
报道了一种新的合成方法，制备烷基化引达省二噻吩并[3，2-B]噻吩类非富勒烯受体（C8-ITIC）。与已报道的具有苯烷基侧链的ITIC相比，新的受体C8-ITIC表现出光学带隙的减小、更高的吸收率和增加的结晶倾向。因此，与供体聚合物PBDB-T的共混物表现出高达12.4%的功率转换效率（PCE）。在给体聚合物的骨架氟化后，发现效率进一步提高，得到了新型材料PFBDB-T。由于较高的开路电压，与C8-ITIC的混合物显示出高达13.2%的令人印象深刻的PCE。电致发光的研究表明，主链取代减少了共混物的能量损失，PFBDB-T/C8-ITIC基电池表现出0.6 eV的小能量损失和19.6 mA cm（-2）的高J（SC）。
A new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T. The resulting blend with C8-ITIC shows an impressive PCE up to 13.2% as a result of the higher open-circuit voltage. Electroluminescence studies demonstrate that backbone fluorination reduces the energy loss of the blends, with PFBDB-T/C8-ITIC-based cells exhibiting a small energy loss of 0.6 eV combined with a high J(SC) of 19.6 mA cm(-2).