Park Su Hong, Kwon Na Yeon, Kim Hyung Jong, Cho Eunbin, Kang Hungu, Harit Amit Kumar, Woo Han Young, Yoon Hyo Jae, Cho Min Ju, Choi Dong Hoon
Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-Ro, Sungbuk-gu, Seoul 02841, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Mar 24;13(11):13487-13498. doi: 10.1021/acsami.0c22946. Epub 2021 Mar 12.
Conjugated random terpolymers, , , and were successfully synthesized from three different monomers. Fluorine-substituted benzotriazole (2F-BTA) was incorporated into 4,8-bis(4-chlorothiophen-2-yl)benzo[1,2-:4,5-']dithiophene (BDT-T-Cl) and a 1,3-bis(4-(2-ethylhexyl)thiophen-2-yl)-5,7-bis(2-alkyl)benzo[1,2-:4,5-']dithiophene-4,8-dione (BDD)-based alternating copolymer PM7 as a third monomeric unit. The solubility of the random terpolymers in nonhalogenated solvents increased with the number of 2F-BTA units in PM7. The random terpolymers were mixed with 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-:2',3'-']--indaceno[1,2-:5,6-']dithiophene (IT-4F) to fabricate organic photovoltaic (OPV) cells. Among the three terpolymers and two related binary copolymers (e.g., PM7 and J52-Cl), outdoor photovoltaic (PV) cells (AM 1.5G) based on the :IT-4F blend showed a high power conversion efficiency (PCE) of 11.34%. In addition, was employed as a donor in indoor PV (IPV) cells and was blended with nonfullerene acceptors, which have different absorption ranges. Among them, the IT-4F-based IPV device had the highest PCE of 17.41% with a of 54.75 μA cm and an FF of 0.77 under 160 μW cm light-emitting diode (LED) light. The terpolymer introduced in this study can be regarded as a promising material for the fabrication of outdoor PV and IPV cells with excellent performance involving the use of an eco-friendly solvent.
共轭无规三元共聚物、、和由三种不同单体成功合成。氟取代苯并三唑（2F-BTA）被引入到4,8-双（4-氯噻吩-2-基）苯并[1,2-：4,5-']二噻吩（BDT-T-Cl）和基于1,3-双（4-（2-乙基己基）噻吩-2-基）-5,7-双（2-烷基）苯并[1,2-：4,5-']二噻吩-4,8-二酮（BDD）的交替共聚物PM7中作为第三单体单元。无规三元共聚物在非卤代溶剂中的溶解度随PM7中2F-BTA单元数量的增加而增加。将无规三元共聚物与3,9-双（2-亚甲基-（（3-（1,1-二氰基亚甲基）-6,7-二氟）-茚满酮））-5,5,11,11-四（4-己基苯基）-二噻吩并[2,3-：2',3'-']-茚并[1,2-：5,6-']二噻吩（IT-4F）混合以制备有机光伏（OPV）电池。在这三种三元共聚物和两种相关二元共聚物（例如，PM7和J52-Cl）中，基于：IT-4F共混物的户外光伏（PV）电池（AM 1.5G）显示出11.34%的高功率转换效率（PCE）。此外，被用作室内光伏（IPV）电池中的供体，并与具有不同吸收范围的非富勒烯受体共混。其中，基于IT-4F的IPV器件在160μW cm发光二极管（LED）光下具有最高的PCE，为17.41%，电流密度为54.75μA cm，填充因子为0.77。本研究中引入的三元共聚物可被视为一种有前途的材料，用于制造具有优异性能的户外PV和IPV电池，包括使用环保溶剂。
