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Synergistic Modifications of Side Chains and End Groups in Small Molecular Acceptors for High Efficient Non‐Fullerene Organic Solar Cells
Author(s) -
Feng Huanran,
Yi YuanQiuQiang,
Ke Xin,
Zhang Yamin,
Wan Xiangjian,
Li Chenxi,
Chen Yongsheng
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800053
Subject(s) - alkoxy group , organic solar cell , side chain , acceptor , electron acceptor , energy conversion efficiency , materials science , homo/lumo , fullerene , combinatorial chemistry , chemistry , photochemistry , polymer , organic chemistry , molecule , optoelectronics , alkyl , physics , condensed matter physics
Two new acceptor‐donor‐acceptor (A‐D‐A) type non‐fullerene acceptors, O‐NTIC and O‐NTNC, using hexacyclic naphthalene (cyclopentadithiophene) (NT) as the electron‐donating unit, and dicycanovinylindan‐1‐one (INCN) or phenyl‐fused dicycanovinylindan‐1‐one (NINCN) as the electron‐deficient unit, respectively, are synthesized. From the perspective of synthesis easiness and cost, para‐alkoxy‐phenyl is used as side chains of the NT core. It is worth noting that the introduction of para‐alkoxy‐phenyl unit could tune the molecular energy levels and lift the open‐circuit voltage ( V oc ). Compared with O‐NTIC, the introduction of extended end‐groups NINCN leads to a more ordered packing structure, much red‐shifted absorption and enhanced electron mobility of O‐NTNC. With polymer PBDB‐T as the donor, the organic solar cell (OSC) devices obtain a decent power conversion efficiency (PCE) of 9.1% for O‐NTIC and much improved PCE of 11.0% for O‐NTNC, respectively. Moreover, with a polythiophene derivative named PDCBT as the donor material, the PDCBT:O‐NTNC based device exhibits a PCE of 10.0%, among the highest PCEs for PDCBT devices. These results indicate that O‐NTNC has great potential on the application for high performance and low‐cost OSCs, and the extended end group NINCN as well as para‐alkoxy‐phenyl side chain substituted core could be promising units for the design of materials with high performance.