Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency

Chai, Gaoda; Chang, Yuan; Zhang, Jianquan; Xu, Xiaopeng; Yu, Liyang; Zou, Xinhui; Li, Xiaojun; Chen, Yuzhong; Luo, Siwei; Liu, Binbin; Bai, Fujin; Luo, Zhenghui; Han, Yu; Liang, Jiaen; Liu, Tao; Wong, Kam Sing; Zhou, Hang; Peng, Qiang; Yan, He

doi:10.1039/d0ee03506h

Cited by 197 publications

(175 citation statements)

References 86 publications

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“…The optimal OPV cells obtained an outstanding PCE of 17.8%. Recently, Yan and co-workers [32] investigated the influence of orientation of side chains on the properties of NFAs and the performance of the NFPSCs. The device based on NFSMAs with a meta-positioned hexylphenyl group exhibited more suitable phase separation and enhanced molecular packing, which yielded an impressive PCE of 17.7%.…”

Section: Introductionmentioning

confidence: 99%

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

et al. 2021

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Side-chain engineering has been considered as one of the most promising strategies to optimize non-fullerene small-molecule acceptors (NFSMAs). Previous efforts were focused on the optimization of alkyl-chain length, shape, and branching sites. In this work, we propose that asymmetric side-chain engineering can effectively tune the properties of NFSMAs and improve the power conversion efficiency (PCE) for binary non-fullerene polymer solar cells (NFPSCs). Specifically, by introducing asymmetric side chains into the central core, both of the absorption spectra and molecule orientation of NFSMAs are efficiently tuned. When blended with polymer donor PM6, NFPSCs with EH-HD-4F (2-ethylhexyl and 2-hexyldecyl side chains) demonstrate a champion PCE of 18.38% with a short-circuit current density (J SC ) of 27.48 mA cm −2 , an open circuit voltage (V OC ) of 0.84 V, and a fill factor (FF) of 0.79. Further studies manifest that the proper asymmetric side chains in NFSMAs could induce more favorable face-on molecule orientation, enhance carrier mobilities, balance charge transport, and reduce recombination losses.

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Section: Introductionmentioning

confidence: 99%

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

et al. 2021

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“…During the past five years, the development of narrow optical bandgap non‐fullerene electron acceptors (NFAs) like Y6 further extends the solar response spectrum of organic solar cells and PCEs above 16% has been widely demonstrated. [ 23–25 ] Concurrently, CsPbX 3 (X = Cl − , Br − , I − , or mixed‐halide) QDs with all‐inorganic crystal structures have emerged as a rising star for optoelectronic applications because of their stronger flexibility in adjusting the composition, optical and electrical properties, high photoluminescence quantum yields (PLQYs) due to impressive defect tolerance. Advances in CsPbI 3 QD solar cells have enabled high efficiency over 14%, [ 26–31 ] showing great potential for QD PVs.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Yuan¹,

Zhang²,

Sun³

et al. 2021

Adv Funct Materials

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Organic‐inorganic hybrid film using conjugated materials and quantum dots (QDs) are of great interest for solution‐processed optoelectronic devices, including photovoltaics (PVs). However, it is still challenging to fabricate conductive hybrid films to maximize their PV performance. Herein, for the first time, superior PV performance of hybrid solar cells consisting of CsPbI3 perovskite QDs and Y6 series non‐fullerene molecules is demonstrated and further highlights their importance on hybrid device design. In specific, a hybrid active layer is developed using CsPbI3 QDs and non‐fullerene molecules, enabling a type‐II energy alignment for efficient charge transfer and extraction. Additionally, the non‐fullerene molecules can well passivate the QDs, reducing surface defects and energetic disorder. The champion CsPbI3 QD/Y6‐F hybrid device has a record‐high efficiency of 15.05% for QD/organic hybrid PV devices, paving a new way to construct solution‐processable hybrid film for efficient optoelectronic devices.

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“…The power conversion efficiencies (PCEs) of the multiple component systems were boosted from 10% to now over 18% in only five years mainly due to the rise of narrow‐bandgap nonfullerene electron acceptors (NFAs) like Y6. [ 15–18 ] Inspired by the rapid progress, one needs to rationally consider the possible molecular design of organic semiconductors on relevant SCOSCs applications.…”

Section: Introductionmentioning

confidence: 99%

Narrow‐Bandgap Single‐Component Polymer Solar Cells with Approaching 9% Efficiency

Yuan

Zhang

et al. 2021

Advanced Materials

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Two narrow‐bandgap block conjugated polymers with a (D1–A1)–(D2–A2) backbone architecture, namely PBDB‐T‐b‐PIDIC2T and PBDB‐T‐b‐PTY6, are designed and synthesized for single‐component organic solar cells (SCOSCs). Both polymers contain same donor polymer, PBDB‐T, but different polymerized nonfullerene molecule acceptors. Compared to all previously reported materials for SCOSCs, PBDB‐T‐b‐PIDIC2T and PBDB‐T‐b‐PTY6 exhibit narrower bandgap for better light harvesting. When incorporated into SCOSCs, the short‐circuit current density (Jsc) is significantly improved to over 15 mA cm−2, together with a record‐high power conversion efficiency (PCE) of 8.64%. Moreover, these block copolymers exhibit low energy loss due to high charge transfer (CT) states (Ect) plus small non‐radiative loss (0.26 eV), and improved stability under both ambient condition and continuous 80 °C thermal stresses for over 1000 h. Determination of the charge carrier dynamics and film morphology in these SCOSCs reveals increased carrier recombination, relative to binary bulk‐heterojunction devices, which is mainly due to reduced ordering of both donor and acceptor fragments. The close structural relationship between block polymers and their binary counterparts also provides an excellent framework to explore further molecular features that impact the photovoltaic performance and boost the state‐of‐the‐art efficiency of SCOSCs.

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Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency

Abstract: Regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility and solar cell performances, which enables high-performance devices with efficiency approaching 18%.

Cited by 197 publications

References 86 publications

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors

Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Narrow‐Bandgap Single‐Component Polymer Solar Cells with Approaching 9% Efficiency

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