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A novel bifunctional A–D–A type small molecule for efficient organic solar cells†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1039/c8qm00223a Jiali Song 1, 2, 3, 4, 5 , Xiaonan Xue 1, 2, 3, 4, 5 , Bingbing Fan 1, 2, 3, 4, 5 , Lijun Huo 1, 2, 3, 4, 5 , Yanming Sun 1, 2, 3, 4, 5
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1039/c8qm00223a Jiali Song 1, 2, 3, 4, 5 , Xiaonan Xue 1, 2, 3, 4, 5 , Bingbing Fan 1, 2, 3, 4, 5 , Lijun Huo 1, 2, 3, 4, 5 , Yanming Sun 1, 2, 3, 4, 5
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A novel A–D–A type small molecule named DTFBR was designed and synthesized, in which the fused rings of fluorene, benzothiadiazole and rhodamine were employed as the core donor, bridge acceptor and terminal acceptor unit respectively. DTFBR exhibited a broad absorption band covering the wavelength range from 350 nm to 700 nm and the HOMO and LUMO energy levels are −5.54 eV and −3.68 eV, respectively. Moreover, DTFBR showed bipolar carrier transport behavior, evidenced by the SCLC measurement, where the electron and hole mobilities are calculated to be 2.21 × 10−4 cm2 V−1 s−1 and 8.95 × 10−5 cm2 V−1 s−1, respectively. The appropriate energy levels and bipolar carrier transport properties make DTFBR a promising bifunctional photovoltaic material. It can function as the acceptor when it is paired with a poly(3-hexylthiophene) (P3HT) donor, yielding a power conversion efficiency (PCE) of 3.7%. When [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) was used as the acceptor, it can function well as a donor and the corresponding organic solar cells (OSCs) showed a PCE of 2.5% with a high open-circuit voltage (Voc) of ∼1.1 V. Our results shed new light on multifunctional photovoltaic material design and OSC application.
中文翻译：
用于高效有机太阳能电池的新型双功能A–D–A型小分子†
设计并合成了一种新型的D–D–A型小分子DTFBR，其中芴，苯并噻二唑和若丹明的稠合环分别用作核心供体，桥受体和末端受体单元。DTFBR展示了覆盖350 nm至700 nm波长范围的宽吸收带，并且HOMO和LUMO能级分别为-5.54 eV和-3.68 eV。此外，DTFBR显示出双极性载流子传输行为，通过SCLC测量证明，其中电子和空穴迁移率的计算值分别为2.21×10 -4 cm 2 V -1 s -1和8.95×10 -5 cm 2 V-1 s -1。合适的能级和双极载流子传输特性使DTFBR成为一种很有前途的双功能光伏材料。与聚（3-己基噻吩）（ P3HT）供体配对时，它可以充当受体，产生3.7％的功率转换效率（PCE）。当使用[6,6]-苯基-C 71-丁酸甲酯（ PC 71 BM）作为受体时，它可以很好地用作供体，相应的有机太阳能电池（OSC）的PCE为2.5％。约1.1 V的高开路电压（ V oc）。我们的结果为多功能光伏材料的设计和OSC应用提供了新的启示。
更新日期：2018-06-25
中文翻译：
用于高效有机太阳能电池的新型双功能A–D–A型小分子†
设计并合成了一种新型的D–D–A型小分子DTFBR，其中芴，苯并噻二唑和若丹明的稠合环分别用作核心供体，桥受体和末端受体单元。DTFBR展示了覆盖350 nm至700 nm波长范围的宽吸收带，并且HOMO和LUMO能级分别为-5.54 eV和-3.68 eV。此外，DTFBR显示出双极性载流子传输行为，通过SCLC测量证明，其中电子和空穴迁移率的计算值分别为2.21×10 -4 cm 2 V -1 s -1和8.95×10 -5 cm 2 V-1 s -1。合适的能级和双极载流子传输特性使DTFBR成为一种很有前途的双功能光伏材料。与聚（3-己基噻吩）（ P3HT）供体配对时，它可以充当受体，产生3.7％的功率转换效率（PCE）。当使用[6,6]-苯基-C 71-丁酸甲酯（ PC 71 BM）作为受体时，它可以很好地用作供体，相应的有机太阳能电池（OSC）的PCE为2.5％。约1.1 V的高开路电压（ V oc）。我们的结果为多功能光伏材料的设计和OSC应用提供了新的启示。
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