Ladder-type nonacyclic indacenodithieno[3,2-b]indole for highly efficient organic field-effect transistors and organic photovoltaics,Journal of Materials Chemistry C

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Ladder-type nonacyclic indacenodithieno[3,2-b]indole for highly efficient organic field-effect transistors and organic photovoltaics
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-08-03 00:00:00 , DOI: 10.1039/c7tc02912h
Baomin Zhao _{1,

2,

3,

4,

5} , Cenqi Yan _{5,

6,

7,

8,

9} , Zheng Wang _{1,

2,

3,

4,

5} , Hongyan Huang _{1,

2,

3,

4,

5} , Yueming Hu _{1,

2,

3,

4,

5} , Pei Cheng _{5,

6,

7,

8,

9} , Mingdong Yi _{1,

2,

3,

4,

5} , Chengting Huang _{1,

2,

3,

4,

5} , Xiaowei Zhan _{5,

6,

7,

8,

9} , Wei Huang _{1,

2,

3,

4,

5}

Affiliation

Developing electron-donating building blocks for organic semiconductors is still one big chemical challenge to achieve high performance active materials for organic photovoltaics (OPVs). In this work, we have successfully designed and synthesized a novel ladder-type nonacyclic indacenodithieno[3,2-b]indole (IDTI) unit via intramolecular annulation with rigid and coplanar features. Two donor–acceptor copolymers of PIDTI-BT and PIDTI-DTBT were synthesized by utilizing the Suzuki and Stille coupling polymerization method with IDTI units. Both copolymers displayed excellent solubility, high thermal stability, broad absorption and a low band gap. The FET hole mobility reaches 2.1 × 10⁻² and 1.4 × 10⁻² cm² V⁻¹ s⁻¹ for PIDTI-BT and PIDTI-DTBT, respectively. The conventional bulk-heterojunction (BHJ) polymer solar cell (PSC) devices based on the PIDTI-BT

PC₇₁BM (1

2 in wt%) blend exhibit a moderate PCE of 4.02% with a V_oc of 0.82 V, a J_sc of 8.99 mA cm⁻² and a FF of 54.6% under AM 1.5G, 100 mW cm⁻² illumination, which is among the highest values for polymer donor materials based on multifused TI units. The improved performance may be associated with the extended conjugation length, which optimizes the interchain interactions and improves molecular organization for accelerating charge transport. Our results demonstrate that the multifused nonacyclic TIBDP as the donor unit is very promising for application in PSCs and FETs.

中文翻译：

用于高效有机场效应晶体管和有机光伏的梯型非无环茚并二噻吩并[3,2- b ]吲哚

开发用于有机半导体的电子给体构建基块仍然是实现用于有机光伏（OPV）的高性能活性材料的一项重大化学挑战。在这项工作中，我们已经成功地设计并合成了一种新型梯型nonacyclic indacenodithieno并[3,2- b ]吲哚（IDTI）单元通过具有刚性和共面的特征的分子内成环。的两个供体-受体共聚物PIDTI-BT和PIDTI-DTBT通过利用铃木和Stille偶联的聚合方法用合成IDTI单元。两种共聚物均显示出优异的溶解性，高热稳定性，宽吸收性和低带隙。FET空穴迁移率达到2.1×10PIDTI-BT和PIDTI-DTBT分别为^-2和1.4×10^-2 cm² V^-1 s^-1。基于PIDTI-BT： PC ₇₁ BM（1：2 in wt％）共混物的常规体-异质结（BHJ）聚合物太阳能电池（PSC）器件显示4.02％的中等PCE和0.82 V的V _oc，在AM 1.5G，100 mW cm^-2的光照下， J _sc为8.99 mA cm^-2，且FF为54.6％，这是基于多熔体TI的聚合物供体材料的最高值

单位。改善的性能可能与共轭长度的延长有关，这优化了链间相互作用并改善了分子结构，从而加速了电荷的传输。我们的结果表明，多融合非环式TIBDP作为供体单元在PSC和FET中的应用非常有前途。

更新日期：2017-09-14

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