Recent progress and prospects of dimer and multimer acceptors for efficient and stable polymer solar cells

Lee, Jin-Woo; Park, Jin Su; Jeon, Hyesu; Lee, Seungjin; Jeong, Dahyun; Lee, Changyeon; Kim, Yun-Hi; Kim, Bumjoon J.

doi:10.1039/d3cs00895a

Cited by 33 publications

(2 citation statements)

References 221 publications

(460 reference statements)

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“…2, research on OSCs has revolved around emerging acceptors, including the classic PCBM-family, ITIC-family, and the more recent BTP-family acceptors with PCEs over 19%, 3,11 along with dimer/multimer acceptors and low-cost non-fused ring acceptors. 12,14,16,65–79 It is well known that light can induce photochemical reactions, leading to the formation of photodegradation products. 24,37,38,80 Furthermore, the presence of O 2 and H 2 O during illumination can facilitate these photochemical reactions and also result in the generation of additional photodegraded products.…”

Section: Chemical Stability and Degradation Mechanisms Of Electron Ac...mentioning

confidence: 99%

“…4–7 In recent years, numerous chemists have made a dedicated effort to develop electron acceptor (A) and donor (D) materials and boost device performances to over 19% efficiency. 8–14 For high-performance OSCs, the incorporation of a bulk heterojunction (BHJ) photoactive layer is crucial. 10,15,16 The BHJ layer consists of a continuous network of A and D materials, which can facilitate efficient exciton dissociation, charge generation, and transportation processes.…”

Section: Introductionmentioning

confidence: 99%

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Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Han,

Xu,

Paleti

et al. 2024

Chem. Soc. Rev.

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Section: Chemical Stability and Degradation Mechanisms Of Electron Ac...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Han,

Xu,

Paleti

et al. 2024

Chem. Soc. Rev.

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Aggregation Regulation of Acceptor via Thiophene‐Substituted Alkyl Chains Enables High‐Performance Toluene‐Processed Organic Solar Cells without Additive and Post‐Treatment

Jiang,

Yang,

Shen

et al. 2024

Adv Funct Materials

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Due to the mismatched aggregation behavior and limited compatibility between the donor and acceptor, it is a challenge for the active layer of organic solar cells (OSCs) to spontaneously realize well‐developed morphology in nonhalogenated solvents. In this contribution, an aggregation regulation strategy for acceptors with strong aggregation is developed via thiophene‐substituted alkyl chain engineering to fabricate high‐performance nonhalogenated solvent‐processed OSCs without an additive or post‐treatment. With the replacement of alkyl chains with steric conjugated thiophene‐substituted alkyl chains, the resulting acceptor (namely BTP‐2T, BTP‐T, and BTP‐T‐BO) shows reduced aggregation to match the polymer donor D18‐Cl using toluene as a processing solvent, enabling ordered molecular arrangement and uniform phase separation morphology. Especially, the combined modification of the asymmetric thiophene‐substituted inner chain and branched outer side chains for BTP‐T‐BO enables the formation of a superior nanoscale bi‐continuous interpenetrating network along with ordered and compact molecular packing in the D18‐Cl:BTP‐T‐BO blend. As a result, an excellent PCE of 18.05% is achieved in the D18‐Cl:BTP‐T‐BO‐based device using toluene as the processing solvent without any extra treatment, which is the highest value for nonhalogenated solvent‐processed OSCs without any extra treatment.

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Understanding the Nonradiative Charge Recombination in Organic Photovoltaics: From Molecule to Device

Kong,

Chen,

Zuo

2024

Adv Funct Materials

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Organic photovoltaics (OPVs) have made significant strides with efficiencies now exceeding 20%, positioning them as potential competitors to inorganic solar technologies. One of the most critical challenges toward this goal is the severe open‐circuit voltage (Voc) loss caused by the nonradiative charge recombination (NRCR). Herein, this review comprehensively summarizes the NRCR mechanisms and suppression techniques of OPVs across various scales from molecule to device. Specifically, the origins of NRCR in a single molecule are first summarized, and molecular design principles toward high photoluminescence quantum yield are reviewed following the Marcus theory. Next, the effect of aggregation on NRCR is reviewed, as well as the molecular and processing strategies to modulate the film packing for NRCR suppression. Furthermore, the progresses in the avoidance of nonradiative loss pathways mediated by charge transfer states and triplet states in donor:acceptor bulk heterojunctions are tracked. Besides, the interfacial optimization and device structure design to maximize the electroluminescent quantum efficiency are presented. Finally, several potential pathways toward curtailing NRCR for high‐performance OPVs are outlined. Therefore, this review shows an insightful perspective to understand and mitigate the NRCR at multi‐scales, and is poised to provide a clear roadmap for the next breakthrough of OPVs.

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Recent progress and prospects of dimer and multimer acceptors for efficient and stable polymer solar cells

Abstract: This review summarizes the recent progress, key design principles and prospects of dimer and multimer acceptors for developing polymer solar cells (PSCs) with high efficiency and long-term stability.

Cited by 33 publications

References 221 publications

Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Understanding photochemical degradation mechanisms in photoactive layer materials for organic solar cells

Aggregation Regulation of Acceptor via Thiophene‐Substituted Alkyl Chains Enables High‐Performance Toluene‐Processed Organic Solar Cells without Additive and Post‐Treatment

Understanding the Nonradiative Charge Recombination in Organic Photovoltaics: From Molecule to Device

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