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2D Conjugated Polyelectrolytes Possessing Identical Backbone with Active‐Layer Polymer as Cathode Interlayer for Organic Solar Cells
Author(s) -
Liu Xuan,
Nie Wei,
Tu Dandan,
Guo Xin,
Li Can
Publication year - 2020
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201900624
Subject(s) - conjugated system , fullerene , materials science , cathode , active layer , polymer , polymer solar cell , organic solar cell , chemical engineering , side chain , polyelectrolyte , polymer chemistry , alkyl , layer (electronics) , nanotechnology , organic chemistry , chemistry , composite material , thin film transistor , engineering
Abstract A 2D conjugated polyelectrolyte (CPE), PBDTTh‐TT‐NBr, having the same backbone as the highly efficient donor polymer PTB7‐Th and the quaternary ammonium pendant, is synthesized as a cathode interlayer (CIL) material for PTB7‐Th‐based fullerene and non‐fullerene solar cells. The quaternary ammonium group is connected to the 2D conjugated backbone by a long, flexible alkyl chain, facilitating the modification of cathode via forming interface dipoles. Moreover, compared with another CPE analogue to PTB7, PBDT‐TT‐NBr, without the 2D conjugated backbone, the PBDTTh‐TT‐NBr presents a higher similarity in polymer structure to the donor polymer PTB7‐Th. This feature makes it more compatible with the PTB7‐Th‐based active‐layer film, improving the electron transport. With the PBDTTh‐TT‐NBr as the CIL, devices afford higher performances than those using the PBDT‐TT‐NBr in both fullerene and non‐fullerene systems. This work offers guidance on choosing the CIL material that ought to possess a highly similar structure to the active‐layer component.