Structural Fusion Yields Guest Acceptors that Enable Ternary Organic Solar Cells with 18.77 % Efficiency

Abstract

The design and selection of a suitable guest acceptor are particularly important for improving the photovoltaic performance of ternary organic solar cells (OSCs). Herein, we designed and successfully synthesized two asymmetric silicon–oxygen bridged guest acceptors, which featured distinct blue‐shifted absorption, upshifted lowest unoccupied molecular orbital energy levels, and larger dipole moments than symmetric silicon–oxygen‐bridged acceptor. Ternary devices with the incorporation of 14.2 wt % these two asymmetric guest acceptors exhibited excellent performance with power conversion efficiencies (PCEs) of 18.22 % and 18.77 %, respectively. Our success in precise control of material properties via structural fusion of five‐membered carbon linkages and six‐membered silicon–oxygen connection at the central electron‐donating core unit of fused‐ring electron acceptors can attract considerable attention and bring new vigor and vitality for developing new materials toward more efficient OSCs.

Isomerization strategy on a non-fullerene guest acceptor for stable organic solar cells with over 19% efficiency

“…The cascaded energy level alignments were favorable for efficient charge transfer at the D-A interface to reduce energy losses, thereby improving the V OC . 39,40 Paper…”

“…The cascaded energy level alignments should be the main reason for reducing the energy losses. 40 Flexible devices have attracted much attention as a promising power source for wearable electronics. [55][56][57] Here, a conventional device architecture of PET/Ag grids/D-PH1000/PEDOT:PSS/active layer/PDINN/Ag was fabricated.…”

Additive-Free All-Green Solvent-Processed Efficient and Stable Pseudo-Bilayer Bulk Heterojunction Ternary Organic Solar Cells

“…As shown in Figure 3c, the n values for the BHJ, PPHJ, and PBHJ devices were determined to be 1.42, 1.54, and 1.26, respectively, which indicate a significant suppression of trapassisted recombination in PBHJ devices. 46,47 As shown in Figure 3d,e, quantitative analysis of the charge lifetime and extraction property in devices was carried out by transient photocurrent (TPC) and transient photovoltage (TPV) decay kinetics characterizations. The TPC measurement was used to investigate the competition between carrier sweep-out and recombination during operation.…”

Fine‐Tuning Alkyl Chains on Quinoxaline Nonfullerene Acceptors Enables High‐Efficiency Ternary Organic Solar Cells with Optimizing Molecular Stacking and Reducing Energy Loss

“…In the 650-900 nm region, N3, Qx-p- As shown in Figure S15 (Supporting Information), the energy levels of the D18-Cl, N3, Qx-p-C 7 H 8 O, and Qx-m-C 7 H 8 O have been tested by cyclic voltammetry. [11] In Table S1 Subsequent contact angle test indicated that N3 and two new acceptors should combine well to form composites that approximate alloys in relevant Bhlk heterojunction (BHJ) blend film. [6] Because they possess extremely similar chemical structures.…”