Near‐Infrared Absorbing Nonfullerene Acceptors for Organic Solar Cells

Gao, Wei; Lin, Francis; Jen, Alex K.‐Y.

doi:10.1002/solr.202100868

Cited by 20 publications

(18 citation statements)

References 99 publications

(130 reference statements)

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“…To realize this goal, we have rationally designed a pseudosymmetric electron acceptor, BS3TSe-4F (Figure 1a), combining our previous findings on selenium-substitution [47][48][49][50][51][52][53] and breaking the symmetry of Y6 derivatives. [7,8,[54][55][56][57][58][59][60] By regio-selectively replacing the two sulfur atoms in the central and lateral positions with selenium on the π-core of previously reported BP4T-4F, [7] the typical molecular packing mode of Y6 derivatives is maintained and the exciton binding strength is further reduced for more efficient generation of free charges under illumination. For comparison, another symmetric acceptor S9TBO-F with selenium substitution only in the central position of π-core was also synthesized for comparison.…”

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Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

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flexibility, and tunable optical transparency, which are advantageous for applications in building-integrated photovoltaic (PV) and wearable electronics compared with conventional inorganic cells. [1][2][3][4][5] To achieve high efficiency, it is essential to develop suitable donor (D) and acceptor (A) materials that can be easily processed into a finely phase-separated morphology in active layer with low energy loss (E loss ) in OSCs. [6][7][8][9] Recently, the vibrant progress made on nonfullerene acceptors (NFAs), [10,11] especially the Y-series NFAs, [12] with facilely tailored chemical structures and precisely tuned bandgap, energy levels, and crystallization properties, has enabled OSCs to achieve very high power conversion efficiencies (PCEs) ≈19%. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] The bulk-heterojunction (BHJ) architecture-based devices prepared from mixing D and A in solution is the most widely adopted method for depositing photoactive layer and have successfully increased the PCE of single-junction OSCs to 19% recently. [31] Another emerging strategy is to deposit neat D and A materials A record power conversion efficiency (PCE) of over 19% is realized in planarmixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy in making a pseudosymmetric electron acceptor, BS3TSe-4F. The combined molecular asymmetry with more polarizable selenium substitution increases the dielectric constant of the D18/ BS3TSe-4F blend, helping lower the exciton binding energy. On the other hand, dimer packing in BS3TSe-4F is facilitated to enable free charge generation, helping more efficient exciton dissociation and lowering the radiative recombination loss (ΔE 2 ) of OSCs. As a result, PMHJ OSCs based on D18/BS3TSe-4F achieve a PCE of 18.48%. By incorporating another mid-bandgap acceptor Y6-O into D18/BS3TSe-4F to form a ternary PMHJ, a higher open-circuit voltage (V OC ) can be achieved to realize an impressive PCE of 19.03%. The findings of using pseudosymmetric electron acceptors in enhancing device efficiency provides an effective way to develop highly efficient acceptor materials for OSCs.

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Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

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“…Ever since the debut of acceptor-donor-acceptor (A-D-A)-type NFAs, their development has led to a great breakthrough in the past few years owing to their tunable energy levels and strong light-harvesting ability in the visible and NIR region. [49][50][51] In this review, we mainly focus on NFAs incorporated with selenium atom and provide a comprehensive understanding on the relationship between structure, property, and performance.…”

Section: Selenium-incorporated Nonfullerene Acceptorsmentioning

confidence: 99%

Selenium: A Unique Member in the Chalcogen Family for Conjugated Materials Used in Perovskite and Organic Solar Cells

2022

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Organic conjugated materials play an extremely important role in the development of perovskite and organic solar cells (PVSCs and OSCs). Among different molecular design strategies, the introduction of selenium is an efficient way to optimize material properties and improve the performance of solar cells. The benefits can be attributed to the looser electron cloud delocalization and more polarizable nature of selenium, which help enable stronger intermolecular Se···Se interaction and extended conjugation length, leading to enhanced charge carrier mobility and redshifted absorption in selenium‐incorporated organic conjugated materials. Herein, the design of the selenium‐incorporated materials applied in the PVSCs and OSCs to provide a systematic study on the relationship between chemical structures, material properties, and device performance is focused on. The future direction for further development of selenium‐incorporated organic conjugated materials is also provided.

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“…In general, strong donor–acceptor (D–A) planar structure is beneficial to achieve high intramolecular charge transfer effect, low bandgap, and high charge mobility [3b,6] . The D–A organic semiconductors are well developed with the design of stable electron‐deficient frameworks ( Scheme ) such as naphthalene diimide [ 7 ] (NDI), perylene diimide [ 8 ] (PDI), isoindigo, [ 9 ] and double B←N‐bridged bipyridine [ 10 ] (BNBP).…”

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confidence: 99%

Stable Open‐Shell IC‐Fused Fluorenyl Enabling Efficient Photothermal Conversion

et al. 2022

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2‐(3‐Oxo‐2,3‐dihydro‐1H‐inden‐1‐yli‐dene)malononitrile (IC) derivatives are popular and crucial acceptor building blocks for the construction of highly efficient n‐type organic semiconductors. However, it is still challenging to increase their relatively poor chemical stability and photostability, originating from their unstable vinyl protons. Herein, two stable acceptor–donor–acceptor narrow‐bandgap materials LY1 and LY2 via replacing the IC series end groups of typical nonfullerene acceptors with IC‐fused fluorenyls are reported. The enhanced conjugation and strong electron‐withdrawing capability enable LY1 and LY2 to show lower bandgap, a deeper lowest unoccupied molecular orbital energy level, enhanced electrochemical stability, and significantly improved photostability compared with IT‐4F and IT‐4Cl. Benefiting from the broadened absorption and promoted nonradiative transition, LY1 and LY2 display enhanced photothermal conversion performance, presenting as promising pure organic photothermal materials.

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Near‐Infrared Absorbing Nonfullerene Acceptors for Organic Solar Cells

Cited by 20 publications

References 99 publications

Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

Selenium: A Unique Member in the Chalcogen Family for Conjugated Materials Used in Perovskite and Organic Solar Cells

Stable Open‐Shell IC‐Fused Fluorenyl Enabling Efficient Photothermal Conversion

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