Easily Available High‐Performance Organic Solar Cells by Regulating Phenylalkyl Side Groups of Non‐Fused Ring Electron Acceptors

Abstract

Although non-fused ring electron acceptors (NFREAs) have received increasing attention due to their relatively low synthetic costs, the achievement of high efficiencies strongly depends on tedious pre-or/and posttreatments to refine the active layers, which in turn greatly increase fabrication complexity and expense of organic solar cells (OSCs). Nowadays most of the available as-cast devices based on NFREAs are below 12% efficiencies. Herein, phenylalkyl category side groups (CnPh) are employed to construct new NFREAs named BOR-CnPh (n = 3, 4, and 6), which exhibit inherently decent molecular aggregation and thus exclude additional treatments from device fabrication. The modified alkyl spacers of CnPh side groups not only trigger different aggregation of the acceptors, but also regulate the interaction conformations of donor (D) and acceptor (A), and thus D/A interactions. Encouragingly, the pristine PBDB-T:BOR-C4Ph blend delivers intrinsic fibrous networks with dominating face-on orientation, which yields an optimal efficiency up to 13.12%, and ranks as the highest value among as-cast OSCs based on NFREAs. This research provides a practical strategy to control molecular aggregations, interactions, and pristine heterojunction morphologies for easily available and high-performance organic photovoltaics.

Achieving More Insight on the Dynamic Process from Conventional/Inverted Layer‐by‐Layer All‐Polymer Solar Cells with 17.24% or 12.41% Efficiency

“…[ 39 ] The inductance (L) in the equivalent circuit model is used to eliminate the impact of the connecting line during high‐frequency scanning. [ 40 ] R CT and R OS are the charge transfer resistance and parasitic series resistance, respectively, which can be gained from the equivalent‐circuit model. The fitted parameters of APSCs obtained from the equivalent circuit model are inserted in Figure 4b.…”

Research Advances of Nonfused Ring Acceptors for Organic Solar Cells

“…Bao et al employed phenylalkyl category side groups (CnPh) to construct new NFRAs named BOR-C3Ph, BOR-C4Ph, and BOR-C6Ph, respectively, which exhibit inherently decent molecular aggregation. 108 More intriguingly, the subtle variations in CnPh chains trigger remarkable regulation of aggregation and photovoltaic performance. The BOR-C3Ph receives a disorderly orientated strong self-aggregation property, which can be effectively transformed into superior, orderly face-on orientations for BOR-C4Ph.…”

“…Bao et al employed phenylalkyl category side groups (CnPh) to construct new NFRAs named BOR-C3Ph, BOR-C4Ph, and BOR-C6Ph, respectively, which exhibit inherently decent molecular aggregation . More intriguingly, the subtle variations in CnPh chains trigger remarkable regulation of aggregation and photovoltaic performance.…”

Chemically Recyclable Conjugated Polymer and One‐Shot Preparation of Thermally Stable and Efficient Bulk‐Heterojunction from Recycled Monomer

“…[6][7][8][9][10][11][12][13] Conjugated polymers have important advantages for the realization of eco-and human-friendly electronics, apart from their attractive properties such as scalability, solution processability, ability to be rationally tuned by synthetic design, and diverse material properties. [14][15][16][17][18][19] Extensive work has been conducted in designing fully biodegradable and biocompatible conjugated polymers for electronic device applications such as organic thinfilm transistors (OTFTs). [20][21][22][23][24][25][26][27] More importantly, chemically recyclable conductive polymers can provide a solution for the waste generated by the disposal of electronic devices (e-waste).…”