Highly efficient polymer solar cells with a thienopyrroledione and benzodithiophene containing planar random copolymer†,Polymer Chemistry

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Highly efficient polymer solar cells with a thienopyrroledione and benzodithiophene containing planar random copolymer†
Polymer Chemistry ( IF 4.1 ) Pub Date : 2018-02-09 00:00:00 , DOI: 10.1039/c8py00037a
Taehyo Kim _{1,

2,

3,

4,

5} , Ji Young Lee _{5,

6,

7,

8} , Jungwoo Heo _{3,

4,

5,

9} , Bogyu Lim _{5,

6,

7,

8} , Jin Young Kim _{1,

2,

3,

4,

5}

Affiliation

We synthesized and characterized a new low band-gap copolymer, PBTTFB, incorporating N-alkylthieno[3,4-c]pyrrole-4,6-dione (TPD) as the acceptor and benzodithiophene (BDT) and (2,5-difluorophenylene)dithiophene as the donor units with S⋯F and S⋯O non-covalent intramolecular interactions. The PBTTFB polymer replaced bis(dodecyloxy)benzo[c][1,2,5]thiadiazole (BT) in P1, a previously reported polymer, with 5-dodecyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione and exhibited improved macromolecular planarity and molecular ordering of the molecular structure. UV-vis absorption, electrochemical properties, bulk-heterojuction (BHJ) film morphology, and molecular ordering as well as photovoltaic charaterization derived from PBTTFB were studied and analyzed to explore the effect of the thienopyrroledione unit instead of the benzodithiophene unit in the molecular backbone of the polymer. From photovoltaic charaterization, we obtained an enhanced J_sc value of 14.51 mA cm⁻² from the PBTTFB polymer compared to the J_sc value of 10.54 mA cm⁻² from P1 due to improved macromolecular planarity. Furthermore, PBTTFB exhibited the highest PCE of 8.25% by adding DPE as a processing additive due to better interpenetration networks for improving charge transport and collection.

中文翻译：

含有噻吩并吡咯二酮和苯并二噻吩的平面型无规共聚物的高效聚合物太阳能电池†

我们合成并表征了一种新的低带隙共聚物PBTTFB，其中结合了N-烷基噻吩并[3,4- c ]吡咯-4,6-二酮（TPD）作为受体和苯并二噻吩（BDT）和（2,5-二氟亚苯基））二噻吩作为具有S⋯F和S⋯O非共价分子内相互作用的供体单位。PBTTFB聚合物用5-十二烷基-4 H-噻吩并[3,4- c ]吡咯-4取代了先前报道的聚合物P1中的双（十二烷基氧基）苯并[ c ] [1,2,5]噻二唑（BT）。，6（5小时）-二酮并显示出改善的大分子平面度和分子结构的分子有序性。研究并分析了从PBTTFB衍生的紫外可见吸收，电化学性能，本体异质结（BHJ）膜形态，分子有序化以及光伏特性化，以研究噻吩并吡咯二酮单元代替苯并二噻吩单元在分子骨架中的作用。聚合物。通过光伏表征，我们从PBTTFB聚合物获得的J _sc值提高了14.51 mA cm ^-2，而J _sc值却达到了10.54 mA cm ^-2。由于改善了大分子的平面度，因此从P1中分离出来。此外，由于更好的互穿网络可改善电荷传输和收集，因此通过添加DPE作为加工添加剂，PBTTFB表现出了最高的PCE达8.25％。

更新日期：2018-02-09

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