Quantum Efficiency and Voltage Losses in P3HT: Non-fullerene Solar Cells

Xu, Xiaoyun; Wu, Hongbo; Liang, Shijie; Tang, Zheng; Li, Mengyang; Wang, Jing; Wang, Xiang; Wen, Jin; Li, Weiwei; Ma, Zaifei

doi:10.3866/pku.whxb202201039

Cited by 26 publications

(23 citation statements)

References 55 publications

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“…The E loss can be calculated by the difference between E g and qV oc , where E g can be estimated by the crossing point of absorption and photoluminescence spectra. [ 41 ] Hence, the E loss values of o ‐TT‐Cl and m ‐TT‐Cl‐based devices are determined to be 0.65 and 0.66 eV, respectively. Besides, the charge transfer state energy ( E CT ) can be obtained.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, the charge transfer state energy ( E CT ) can be obtained. [ 41 ] The E CT values of o ‐TT‐Cl and m ‐TT‐Cl‐based devices are 1.44 and 1.42 eV, respectively. In addition, according to the equation (Δ E nr = − kT ln(EQE EL )/ q [ 42 ] ) the nonradiative energy loss (Δ E nr ) of o ‐TT‐Cl and m ‐TT‐Cl‐based devices are estimated to be 0.27 and 0.25 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

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High‐Performance Nonfused Ring Electron Acceptors with V‐Shaped Side Chains

Zhang

Ran

et al. 2022

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Previously, conjugated polymers and fullerene derivatives as the light absorption layer (or active layer) are mainly used to fabricate OSCs. [7] However, fullerene derivatives have some inherent disadvantages, such as high-cost, [8,9] weak absorption, [10,11] nonadjustable energy levels, [12,13] etc. In recent several years, researchers have turned their attention to nonfullerene acceptors (NFAs). Among them, fused ring electron acceptors (FREAs) play dominate roles in NFAs. [14] Generally, FREAs comprise a large electron-rich ladder-type core unit, forming strong ICT with electron-withdrawing end-groups. [14][15][16] Besides, the bulky side chains of FREAs can suppress the aggregation and ensure the acceptor molecules good solubilities. [17,18] Nowadays, the power conversion efficiencies (PCEs) of single and tandem junction OSCs based on FREAs have exceeded 19% [19] and 20% [20] respectively. However, the synthesis of FREAs often needs multi-steps and involves low-yield ring-closing reactions, resulting in high-cost and intensive labor consuming. [21,22] To solve this dilemma, nonfused ring electron acceptors (NFREAs) have received more and more attention recently, which can be modularly synthesized with several steps and greatly reduce the cost of preparation. [23][24][25] At present, the highest PCE of OSCs based on NFREAs is less than 16%, which still stays behind ones based on FREAs. [26] It is necessary to design and synthesize NFREAs with simple structures and high PCEs.Herein, two isomeric NFREAs o-TT-Cl and m-TT-Cl are designed and synthesized with different lateral substituents. Density functional theory (DFT) calculations reveal that these two acceptors both display nearly planar molecular backbones. Differently, o-TT-Cl has a "V" shaped substituent, which distributes at two sides of the molecular backbone. In comparison, m-TT-Cl has a straight substituent, which distributes at only one side of the molecular backbone. Due to the different lateral substituents, o-TT-Cl and m-TT-Cl display different properties, such as solubilities, molecular packing, charge transport mobilities, etc. At last, o-TT-Cl-based OSCs give a PCE 12.84%, which is much higher than that of m-TT-Cl-based ones. This work provides a valuable highperformance molecular design strategy based on side-chain engineering. Motivatedby simplifying the synthesis of nonfullerene acceptor and establishing the relation between molecular structure and photovoltaic performance, two isomeric nonfused ring electron acceptors (o-TT-Cl and m-TT-Cl), whose properties can be adjusted by changing the side chains, are designed and synthesized with several high-yield steps. o-TT-Cl with V-shaped side chain induces a dominated J-aggregation and displays much better solubility and more ordered packing than m-TT-Cl with linear side chain. Thus, the o-TT-Cl-based blend film generates better phase morphology and charge transport than m-TT-Cl-based one. Finally, the power conversion efficiency of o-TT-Cl-based devices is 12.84%, which is much higher than that of...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High‐Performance Nonfused Ring Electron Acceptors with V‐Shaped Side Chains

Zhang

Ran

et al. 2022

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“…IC-based NIR acceptors usually have an ''A-D-A'' configuration, in which A represents IC and its derivatives, and D represents the aromatic core. In general, D cores can be divided into two categories: fused-ring cores, such as ITIC, 3 Y6 and their derivatives, 6,7,23 and non-fused cores. 24 IC-acceptor based fused-ring cores represent the highest performance in OSCs due to the controlled microstructures via large conjugated backbones as well as large steric hindrance, but their high synthetic complexity enhances the cost toward manufacture.…”

Section: Introductionmentioning

confidence: 99%

Naphthobistriazole based non-fused electron acceptors for organic solar cells

Wang

et al. 2022

J. Mater. Chem. C

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“…Polythiophene (PT) has always been considered as the most promising polymer donor to be scaled up due to its straightforward synthesis, relatively high crystallinity and excellent batch reproducibility [13][14][15][16][17] . Figure 1 summarizes the chemical structures of PT and its derivatives featured in this article.…”

Section: Introductionmentioning

confidence: 99%

Ternary organic solar cells featuring polythiophene

Qi¹,

Ke²,

Ye³

2022

Energy Mater

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Benefiting from the creation of new photovoltaic materials and innovations in device architectures, organic photovoltaic (OPV) cells are booming. Nonetheless, their prosperity is also accompanied by challenges, such as tedious synthetic routes, increasing costs and insufficient operational stability under practical stresses. Polythiophene, with a simple chemical structure, high scalability and excellent charge transport ability, is expected to be the most promising candidate among all kinds of polymer donors. Ternary mixing, as a simple and effective method for improving the efficiency and stability of OPVs, has attracted significant attention in recent decades. This review provides an overview of the recent advances in ternary OPVs based on polythiophene and discusses the role of various third components in three types of OPV active layers, where polythiophene serves as either the host material or additive, and also clarifies how the third component plays a role in determining morphology and device performance, and finally proposes future research directions for ternary OPVs featuring polythiophene. In short, this review provides insights into polythiophene-based multicomponent systems and helps readers better understand the relationships between morphology, efficiency and stability.

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Quantum Efficiency and Voltage Losses in P3HT: Non-fullerene Solar Cells

Cited by 26 publications

References 55 publications

High‐Performance Nonfused Ring Electron Acceptors with V‐Shaped Side Chains

High‐Performance Nonfused Ring Electron Acceptors with V‐Shaped Side Chains

Naphthobistriazole based non-fused electron acceptors for organic solar cells

Ternary organic solar cells featuring polythiophene

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