Asymmetric side-chain substitution enables a 3D network acceptor with hydrogen bond assisted crystal packing and enhanced electronic coupling for efficient organic solar cells

Abstract

Side chain modification upon small-molecule acceptors (SMAs) is an effective method to realize high device efficiencies for organic solar cells (OSCs), among which the asymmetric side-chain strategy is a promising...

Alkoxy Substitution on Asymmetric Conjugated Molecule Enabling over 18% Efficiency in Ternary Organic Solar Cells by Reducing Nonradiative Voltage Loss

“…Since 2019, Y6 derivatives (especially for symmetric molecules) have become a hot topic of study in OPVs due to their excellent properties such as low band gaps and high electron mobility. , In addition to the symmetrical nonfullerene acceptors, asymmetrical nonfullerene (ANF) acceptors have recently been used successfully in OPVs. − In general, ANF acceptors are classified as asymmetry skeleton type nonfullerenes (ASNFs, A–D 1 A′D 2 –A) and asymmetry terminal type nonfullerenes (ATNFs, A 1 –DA′D–A 2 ) acceptors. Very recently, ternary OPV devices using the ATNF acceptor as the third component had excellent PCEs of over 19%. , However, an ASNF acceptor as the third component has never been studied or reported.…”

Highly efficient and stable binary all-polymer solar cells enabled by sequential deposition processing tuned microstructures

“…For further understanding of molecular packing and crystallinity change in active layers, grazing incidence wide-angle X-ray scattering (GIWAXS) technology is applied. [54][55][56][57] The 2D patterns and derived line cuts of BC and SqP films are shown in Fig. 4, with calculated parameters of (010) diffraction peaks presented in Table S1 (ESI †).…”

Crystal structures in state-of-the-art non-fullerene electron acceptors

“…The effects of the asymmetric/symmetric side chains on molecular packing behaviours were investigated by Luo et al 40 The crystallographic data of three NFAs, Y6, BTP-PhC6, and their asymmetric derivative namely BTP-PhC6-C11 were explored. The three NFAs show a similar Y-shaped molecular geometry.…”

“…Fig.6The single crystal structures and the 3D network packing of (a) Y6, (b) BTP-PhC6 and (c) BTP-PhC6-C11 along the c-axis. Reproduced with permission 40. Copyright 2022 Royal Society of Chemistry.…”