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Naphtho[1,2-b:5,6-b']dithiophene-Based Conjugated Polymers for Fullerene-Free Inverted Polymer Solar Cells

Naphtho[1,2-b:5,6-b']dithiophene-Based Conjugated Polymers for Fullerene-Free Inverted Polymer Solar Cells

Zhaoyan Jiang, Huan Li, Zhen Wang, Jianqi Zhang, Yajie Zhang, Kun Lu, Zhixiang Wei

Macromol Rapid Commun. 2018 Jul;39(14):e1700872.

PMID: 29573008

Abstract:

Three novel copolymers based on zigzag naphthodithiophene (zNDT) with different aromatic rings as π bridges and different core side substitutions are designed and synthesized (PzNDT-T-1,3-bis(4-(2-ethylhexyl)-thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c']-dithiophene-4,8-dione (BDD), PzNDT-TT-BDD, and PzNDTP-T-BDD, respectively). The 2D conjugation structure and molecular planarity of the polymers can be effectively altered through the modification of conjugated side chains and π-bridges. These alterations contribute to the variation in energy levels, light absorption capacity, and morphology compatibility of the polymers. When blended with the nonfullerene acceptor (2,2'-[(4,4,9,9-tetrahexyl-4,9-dihydro-sindaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis-propanedinitrile) (IDIC), PzNDT-T-BDD exhibits the highest power conversion efficiency (PCE) of 9.72% among the three polymers. This result can be attributed to its superior crystallinity and more obvious face-on orientation in blending film. PzNDT-TT-BDD and PzNDTP-T-BDD present PCE values of 8.20% and 4.62%, respectively. The alteration of polymer structure, particularly the modification of conjugated side chains and π-bridges, is an effective strategy for designing NDT-based polymers with high photovoltaic performance and potential applications in fullerene-free solar cells.

Chemicals Related in the Paper:

Catalog Number	Product Name	CAS Number	Price
AP1134942203	2,6-Ditolylbenzo[1,2-b:4,5-b′]dithiophene	1134942-20-3	Price
AP217196	Naphtho[1,2-b:5,6-b′]dithiophene	217-19-6	Price
AP32281360	Benzo[1,2-b:4,5-b']dithiophene-4,8-dione	32281-36-0	Price

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