Recent Advances of Benzodithiophene‐Based Donor Materials for Organic Solar Cells

Abstract

Recently, the power conversion efficiency (PCE) of organic solar cells (OSCs) has increased dramatically, making a big step toward the industrial application of OSCs. Among numerous OSCs, benzodithiophene (BDT)‐based OSCs stand out in achieving efficient PCE. Notably, single‐junction OSCs using BDT‐based polymers as donor materials have completed a PCE of over 19%, indicating a dramatic potential for preparing high‐performance large‐scale OSCs. This paper reviews the recent progress of OSCs based on BDT polymer donor materials (PDMs). The development of BDT‐based OSCs is concisely summarized. Meanwhile, the relationship between the structure of PDMs and the performance of OSCs is further described in this review. Besides, the development and prospect of single junction OSCs are also discussed.

The isomerization effect of a benzothiophene-substituted benzodithiophene-based donor polymer on the blend morphology and photovoltaic performance of all-polymer solar cells

“…The subtle change of a molecule may impose prominent influence on a material's properties, and the method of isomerization can maintain the optical and energy level properties and the reaction routes of the parent structure to some great extent. Therefore, many isomers have been investigated and compared to each other as the active layer components, 41,42 even though the correlation between isomers and the vertical phase distribution were not disclosed. Appling the isomerization to a state-of-the-art molecular skeleton is highly promising.…”

Substituted quinoxaline based small-molecule donor guests enable 19% efficiency ternary organic solar cells

“…Particularly, benzodithiophene (BDT) has been one of the most popular building blocks to construct small molecule donors (SMDs) for binary/ternary OSCs. 22–24 The rigidity and planar molecular structure confer ideal charge transport characteristics and favorable absorption spectra, rendering them well-suited for effective photon harvesting across a broad spectrum. Additionally, their ease of synthesis and structural versatility enable fine-tuning of electronic and optical properties, thus facilitating the optimization of device performance.…”

Small molecular donor materials based on β–β-bridged BODIPY dimers with a triphenylamine or carbazole unit for efficient organic solar cells

“…, blends of p-type (donor) and n-type (acceptor) organic semiconducting materials, 7 have attracted much attention for their application in the conversion of solar energy into electricity. 2,8–12 Benefiting from the fast development of non-fullerene acceptors (NFAs) with narrow bandgaps and tunable energy levels, the power conversion efficiencies (PCEs) of polymer-based solar cells have dropped into the range of 19–20% 13–22 for BHJ and 20% for tandem structures, 23,24 respectively. Research into Organic Solar Cells (OSCs) is being promoted due to the difficulty of purification and large batch-to-batch variations in the polymer.…”