Water-based layer-by-layer processing enables 19% efficient binary organic solar cells with minimized thickness sensitivity

Abstract

Water processing is an ideal strategy for ecofriendly fabrication of organic solar cells (OSCs), exhibiting strong market driven need. Here, we developed a sequential layer-by-layer (LBL) processing OSCs using a...

Chalcogen Atoms Regulate the Organic Solar Cell Performance of B–N-Based Polymer Donors

“…In recent decades, organic solar cells (OSCs) have attracted considerable attention due to their cost-effectiveness, inherent flexibility, and solution processability. − With the advancement of photoactive materials, single-junction OSCs have achieved power conversion efficiencies (PCEs) exceeding 19%. − Among them, p-type conjugated polymer donors play a pivotal role in further enhancing the performance of organic solar cells. − To engineer high-performance polymer donors, several successful approaches in molecular design have been employed to optimize the performance of OSCs. Among others, boron–nitrogen bond-containing polymer donors have garnered considerable attention due to the distinct physical and chemical properties exhibited by boron and nitrogen atoms compared to carbon atoms. − Devices based on boron–nitrogen bond-containing polymer donors have achieved efficiencies exceeding 19%. , These polymer donors have the potential to enhance the performance of OSCs.…”

Quinquethiophene-based fully nonfused electron acceptors towards efficient organic solar cells via side-chain engineering

“…1–3 In recent years, owing to the development of fused ring electron acceptors (FREAs), especially the ITIC-series with an acceptor–donor–acceptor (A–D–A) structure and Y-series with an A–DA′D–A structure, the power conversion efficiencies (PCEs) of single-junction OSCs have exceeded 19%. 4–21 However, the large rigid ladder-type fused ring cores in these efficient FREAs generally require multiple-step synthesis and purification, resulting in high synthetic costs of acceptors, which has been considered as one of the major obstacles to large-scale production. Nonfused electron acceptors have emerged as potential alternatives for achieving cost-effective OSCs due to their concise synthesis, high stability and low cost.…”

Nonfullerene Acceptors with Aromatic Heterocycle Substitutions for Efficient Organic Solar Cells

“…With the increasing demand for eco-friendly and sustainable energy, solution-processed bulk-heterojunction organic solar cells (OSCs) have attracted considerable attention owing to their inherent advantages in printing fabrication, cost-effectiveness, flexibility, and lightweight properties. − In recent years, nonfullerene acceptors (NFAs), particularly small-molecule acceptors (SMAs), have demonstrated significant progress. The development and design of numerous SMAs have invigorated the field of organic photovoltaics, leading to advancements in the OSC power conversion efficiency (PCE) of up to 19%. ,− Among the various fused-ring SMAs, those adopting acceptor–donor–acceptor (A–D–A) and A-DA 1 D-A-type molecule structures, such as ITIC and Y6, are esteemed for their exceptional device performance. − Typically, these SMAs comprise three essential components: a fused-ring core, side chains, and electron-withdrawing end-groups.…”