Journal ArticleDOI
A Simple Phenyl Group Introduced at the Tail of Alkyl Side Chains of Small Molecular Acceptors: New Strategy to Balance the Crystallinity of Acceptors and Miscibility of Bulk Heterojunction Enabling Highly Efficient Organic Solar Cells.
TLDR
An effective but easily navigable approach is demonstrated to modulate the crystallinity of SMAs toward synergistically improved morphologies and molecular orientations of bulk heterojunction enabling highly efficient OSCs.Abstract:
Research on fused-ring small-molecular-acceptors (SMAs) has deeply advanced the development of organic solar cells (OSCs). Compared to fruitful studies of ladder-type cores and end-caps of SMAs, the exploration of side chains is monotonous. The widely utilized alkyl and aryl side chains usually produce a conflicting association between SMAs' crystallinity and miscibility. Herein, a fresh idea about the modification of side chains is reported to explore the subtle balance between the crystallinity and miscibility. Specifically, a phenyl is introduced to the tail of the alkyl side chain whereby a new acceptor IDIC-C4Ph is reported. Moderately weakened crystallinity is observed, while maintaining preferred absorption profiles and face-on orientations. Concurrently, remarkably improved heterojunction morphologies and stacking orientations are detected. PBDB-T:IDIC-C4Ph devices exhibit greater efficiency of 11.50% than devices from alky and aryl modified acceptors. Notably, the as-cast OSCs of PBDB-TF:IDIC-C4Ph reveal outstanding FF over 76% with the best efficiency up to 13.23%. The annealed devices reveal further increased efficiency exceeding 14% with the state of the art FF of 78.32%. Overall, an effective but easily navigable approach is demonstrated to modulate the crystallinity of SMAs toward synergistically improved morphologies and molecular orientations of bulk heterojunction enabling highly efficient OSCs.read more
Citations
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Journal ArticleDOI
n-Type Molecular Photovoltaic Materials: Design Strategies and Device Applications.
TL;DR: This Perspective analyzes the key design strategies of high-performance n-type molecular photovoltaic materials and highlights instructive examples of their various applications, including in ternary and tandem solar cells towards high efficiency, semitransparentSolar cells towards power generating building facades and windows, and indoor photvoltaics for driving low power consumption devices.
Journal ArticleDOI
High-performance polymer solar cells with efficiency over 18% enabled by asymmetric side chain engineering of non-fullerene acceptors
TL;DR: In this article, 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.
Journal ArticleDOI
Efficient Organic Solar Cells from Molecular Orientation Control of M-Series Acceptors
TL;DR: Based on a ladder-type fused-ring core without sp3-hybridized bridging atoms, novel acceptor-donor-acceptor (A-D-A or ADA)-type nonfullerene acceptors (M3 and M32) are developed, and their molecular orientation behaviors are successfully controlled by the neighboring side chains as mentioned in this paper.
Journal ArticleDOI
Altering alkyl-chains branching positions for boosting the performance of small-molecule acceptors for highly efficient nonfullerene organic solar cells
Zhenghui Luo,Zhenghui Luo,Rui Sun,Cheng Zhong,Tao Liu,Guangye Zhang,Yang Zou,Xuechen Jiao,Jie Min,Chuluo Yang,Chuluo Yang +10 more
TL;DR: In this paper, the authors proposed two new acceptors named Y6C2 and Y6-C3, from judicious alteration of alkyl-chains branching positions away from the Y6 backbone.
Journal ArticleDOI
Unconjugated Side-Chain Engineering Enables Small Molecular Acceptors for Highly Efficient Non-Fullerene Organic Solar Cells: Insights into the Fine-Tuning of Acceptor Properties and Micromorphology
Tao Liu,Tao Liu,Wei Gao,Wei Gao,Yilin Wang,Tao Yang,Ruijie Ma,Guangye Zhang,Cheng Zhong,Wei Ma,He Yan,Chuluo Yang,Chuluo Yang +12 more
References
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Journal ArticleDOI
Thermally stable, efficient polymer solar cells with nanoscale control of the interpenetrating network morphology
TL;DR: By applying specific fabrication conditions summarized in the Experimental section and post-production annealing at 150°C, polymer solar cells with power-conversion efficiency approaching 5% were demonstrated.
Journal ArticleDOI
An electron acceptor challenging fullerenes for efficient polymer solar cells.
TL;DR: A novel non-fullerene electron acceptor (ITIC) that overcomes some of the shortcomings of fullerene acceptors, for example, weak absorption in the visible spectral region and limited energy-level variability, is designed and synthesized.
Journal ArticleDOI
Processing Additives for Improved Efficiency from Bulk Heterojunction Solar Cells
Jae-Kwan Lee,Wanli Ma,Christoph J. Brabec,Jonathan D. Yuen,Ji Sun Moon,Jin Young Kim,Kwanghee Lee,Guillermo C. Bazan,Alan J. Heeger +8 more
TL;DR: Using 1,8-diiodooctane as the processing additive, the efficiency of the BHJ solar cells was improved and the efficiency rating was improved from 3.4% (for the reference device) to 5.1%.
Journal ArticleDOI
Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells
TL;DR: The two new SMAs (IT-M and IT-DM) end-capped by methyl-modified dicycanovinylindan-1-one exhibit upshifted lowest unoccupied molecular orbital (LUMO) levels, and hence higher open-circuit voltages can be observed in the corresponding devices.
Journal ArticleDOI
High-efficiency and air-stable P3HT-based polymer solar cells with a new non-fullerene acceptor
Sarah Holliday,Raja Shahid Ashraf,Andrew Wadsworth,Derya Baran,Syeda Amber Yousaf,Christian B. Nielsen,Ching-Hong Tan,Stoichko D. Dimitrov,Zhengrong Shang,Nicola Gasparini,Maha A. Alamoudi,Frédéric Laquai,Christoph J. Brabec,Alberto Salleo,James R. Durrant,Iain McCulloch,Iain McCulloch +16 more
TL;DR: A new non-fullerene acceptor that has been specifically designed to give improved performance alongside the wide bandgap donor poly(3-hexylthiophene), a polymer with significantly better prospects for commercial OPV due to its relative scalability and stability is presented.