Green‐Processed Non‐Fullerene Organic Solar Cells Based on Y‐Series Acceptors

Abstract

The development of environmentally friendly and sustainable processes for the production of high‐performance organic solar cells (OSCs) has become a critical research area. Currently, Y‐series electron acceptors are widely used in high‐performance OSCs, achieving power conversion efficiencies above 19%. However, these acceptors have large fused conjugated backbones that are well‐soluble in halogenated solvents, such as chloroform and chlorobenzene, but have poor solubility in non‐halogenated green solvents. To overcome this challenge, recent studies have focused on developing green‐processed OSCs that use non‐chlorinated and non‐aromatic solvents to dissolve bulk‐heterojunction photoactive layers based on Y‐series electron acceptors, enabling environmentally friendly fabrication. In this comprehensive review, an overview of recent progress in green‐processed OSCs based on Y‐series acceptors is provided, covering the determination of Hansen solubility parameters, the use of non‐chlorinated solvents, and the dispersion of conjugated nanoparticles in water/alcohol. It is hoped that the timely review will inspire researchers to develop new ideas and approaches in this important field, ultimately leading to the practical application of OSCs.

Efficient Dual Mechanisms Boost the Efficiency of Ternary Solar Cells with Two Compatible Polymer Donors to Exceed 19%

“…[14][15][16] Despite the narrow band gap small molecule acceptors can extend absorption in the near infrared region, it remains challenging to achieve a wide and high spectral response across solar spectrum due to the fact that the maximum solar radiation is located at approximately 500-600 nm. [17][18][19][20] Therefore, introducing materials that cover such band radiation will more efficiently to improve the performance of photovoltaic devices, and these materials are currently typically polymer donors (PDs).…”

“…Additionally, the guest-host compatibility and guest location exhibit less sensitivity compared to those in two PDs-based TOSCs. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] This could potentially elucidate the numerous successful cases of two acceptors based TOSCs. Therefore, a comprehensive investigation into the interplay relationships and inherent enhancement mechanisms in TOSCs are still highly desired to gain a deeper understanding of the structure-function relationship.…”

Enhancing Reproducibility in Organic Solar Cell Fabrication via Static Sequential Deposition with Cross-Linked Polymer Donor and Nonfullerene Acceptor

“…However, very few solvents can act as a good solvent for the acceptor and an orthogonal solvent for the donor because both donor and acceptor organic semiconductors possess similar π-conjugated chemical structures. 24 With the advent of highly crystalline donors and acceptors, nonorthogonal solvents are being increasingly adopted to fabricate pseudobilayer devices. This involves using additives or controlling the temperature on a baseplate during the coating of the second layer.…”

Recent Progress in Dopant‐Free and Green Solvent‐Processable Organic Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

“…[ 31 ] In this way, some potential green solvents were selected, but only a few studies explored the relationship between the chemical structures and HSPs of these HTL materials. [ 32 ] More studies in this area will facilitate the development of new HTL materials that are suitable for green processing.…”