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Abstract
A highly crystalline conjugated donor (D)–acceptor (A) block copolymer (PBDT2T‐b‐N2200) that has good solubility in nonhalogenated solvents is successfully synthesized. PBDT2T‐b‐N2200 shows a broad complementary absorption behavior owing to a wide‐band gap donor (PBDT2T) present as a D‐block and a narrow‐band gap acceptor (N2200) present as an A‐block. Polymer solar cells (PSCs) with conjugated block copolymer (CBCP) are fabricated using a toluene solution and PSC created with an annealed film showing the highest power conversion efficiency of 6.43%, which is 2.4 times higher than that made with an annealed blend film of PBDT2T and N2200. Compared to the blend film, the PBDT2T‐b‐N2200 film exhibits a highly improved surface and internal morphology, as well as a faster photoluminescence decay lifetime, indicating a more efficient photoinduced electron transfer. In addition, the PBDT2T‐b‐N2200 film shows high crystallinity through an effective self‐assembly of each block during thermal annealing and a predominant face‐on chain orientation favorable to a vertical‐type PSC. Moreover, the CBCP‐based PSCs exhibit an excellent shelf‐life time of over 1020 h owing to their morphological stability. From these results, a D–A block copolymer system is one of the efficient strategies to improve miscibility and morphological stability in all polymer blend systems.
Highlights
Many types of conjugated polymers have recently been designed and synthesized to obtain a high power conversion efficiency (PCE) in all-polymer solar cells (All-Polymer solar cells (PSCs)) owing to good film formation property and high mechanical stability for flexible devices.[1–14] Through these efforts, Allcreated with an annealed film showing the highest power conversion efficiency of 6.43%, which is 2.4 times higher than that made with an annealed blend film of PBDT2T and N2200
We found that the PSCs fabricated using the annealed PBDT2T-b-N2200 films from several devices exhibits an excellent reproducibility of PCE (Figure S7, Supporting Information)
We demonstrated a novel fully conjugated D–A block copolymer (PBDT2T-b-N2200) showing high crystallinity and wide complementary absorption behavior for application to PSC devices
Summary
(PBDT2T-b-N2200) that has good solubility in nonhalogenated solvents is successfully synthesized. CBCP consisting of PBDT2T and NDI-Se can be synthesized based on a unique synthesis method (i.e., one-pot polymerization) These types of CBCPs exhibit highly improved PCEs, their films do not show a clear difference in the morphological and crystalline behaviors compared to the case of blended films.[56]. The maximum PCE of a nonhalogenated solvent-processed CBCP-based PSC device was measured as 6.43% after thermal annealing the active layer at 160 °C, which is remarkably higher than that of the blend film Compared to those of a binary blend film using PBDT2T and N2200, a PBDT2T-b-N2200 film shows a dramatically improved surface and an internal morphology. The corresponding CBCP-based PSCs exhibit a superior shelf-life time of their photovoltaic performance of over 1020 h when stored under ambient conditions, without a significant change in morphology
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