Ternary All‐Small‐Molecule Solar Cells with Two Small‐Molecule Donors and Y6 Nonfullerene Acceptor with a Power Conversion Efficiency over Above 14% Processed from a Nonhalogenated Solvent

Guijarro, Fernando G.; Caballero, Rubén; Cruz, Pilar de la; Singhal, Rahul; Langa, Fernando; Sharma, Ganesh D.

doi:10.1002/solr.202000460

Cited by 14 publications

(8 citation statements)

References 76 publications

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“…Guijarro et al reported efficient ternary SMPVs with conjugated small molecules FG3 and FG4 as donors and Y6 as the acceptor. 147 A PCE of 14.31% was yielded in the optimized ternary SMPVs, which is higher than that of FG3:Y6 based SMPVs (10.75%) and FG4:Y6 based SMPVs (11.07%). The J SC and FF values of the optimized ternary SMPVs are higher than the corresponding values of two binary SMPVs, and the V OC is in between that of two binary SMPVs.…”

Section: Ternary Smpvs Based On Two Donorsmentioning

confidence: 82%

Recent progress in all-small-molecule organic photovoltaics

Zhao

Yang

et al. 2022

J. Mater. Chem. A

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Section: Ternary Smpvs Based On Two Donorsmentioning

confidence: 82%

Recent progress in all-small-molecule organic photovoltaics

Zhao

Yang

et al. 2022

J. Mater. Chem. A

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“…Without using BDT‐based small‐molecule donors, Guijarro reported a ternary ASM‐OSCs of FG3:FG4:Y6 [ 122 ] (Figure 9) where FG3 and FG4 are comprised of cyclopenta[2,1‐b:3,4‐b′]dithiophene (CPDT) derivatives and cyano rhodanine. Three component showed complementary absorption spectrum, and the energy transfer was found from FG3 to FG4.…”

Section: Ternary Strategymentioning

confidence: 99%

Organic Photovoltaics Utilizing Small‐Molecule Donors and Y‐Series Nonfullerene Acceptors

Xie

Peng

et al. 2023

Advanced Materials

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since both small-molecule donors and acceptors have not small size and molecular weight in practice). The star polymer donors PBDB-T, [14] PM6, [15] etc. frequently break the PCE record when paired with nonfullerene acceptors (NFAs) such as ITIC (11.21%), [16] Y6 (15.7%), [17] etc. On the other hand, ASM-OSCs have also drawn growing attention owing to the intrinsic advantages like little batch-to-batch variation, good reproducibility, etc. The definite chemical structure and mono-molecular weight distribution give rise to more convenient material synthesis for smallmolecule donors as compared to that of polymers, which is more promising for future application. The high crystallinity as well as ordered molecular arrangement for small-molecule donors can also alleviate the chains torsion, which is favorable to reduce energetic disorders and elevate V oc . [18][19] Despite of these merits, some severe challenges such as not ideal morphology hindered the PCE improvement, and design of novel small-molecule donors and acceptors is highly desirable to achieve higher device efficiency.Throughout the development history, the PCE of OSCs mainly depends on invention of small-molecule acceptor (SMA). The appearances of PCBM (PC 61 BM or PC 71 BM), ITIC, and Y6 represent the three important stages in recent decades. For a long period, fullerene acceptor PCBM was used as the acceptor, and the PCEs have reached over 11% PCE both in ASM-OSCs [20][21] and polymer OSCs. [22][23] Despite some severe drawbacks, PCBM possess some excellent properties which is hard to replace for a long time, mainly including that: a) ease to self-aggregation which enables the formation of BHJ morphology; b) high electron mobility; c) delocalized LUMOs (lowest unoccupied molecular orbital) and 3D charge-transport channel. [2] For fullerene based ASM-OSCs, the crystalline small-molecule donors together with easily aggregated PCBM tend to cause relatively large domain size in blend films, [19] which may diminish the D/A surfaces and thus reduces the exciton dissociation and increases the charge recombination, etc. These drawbacks would raise the higher requirements for donor design and processing protocol of film fabrication. Benzodithiophene (BDT) and oligothiophene based derivatives, which are first reported by Chen's group, [24][25][26][27] are the most widely studied systems and provide the samples for next-generation nonfullerene ASM-OSCs. Generally, the representative small-molecule donors consist of electron-donating core BDT (D), electron-withdrawing end-groups (A) such as The emerging Y-series nonfullerene acceptors (Y-NFA) has prompted the rapid progress of power conversion efficiency (PCE) of all-small-molecule organic solar cells (ASM-OSCs) from around 12% to 17%. The excellent PCE improvement benefits from not only the outstanding properties of Y-series acceptors but also the successful development of small-molecule donors. The short-circuit current density, fill factor, and nonradiative recombination are all optimized to the unprecedented ...

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“…[11,[17][18][19][20][21] In comparison with PSCs, all-small-molecule organic solar cells (ASM-OSCs) composed of small-molecule donor (SMD) and small-molecule acceptor (SMA) have great potential for commercial application on account of the superiority of well-defined molecular structures, easy purification, and better repeatability. [22][23][24][25][26][27][28][29] To date, the PCE of ASM-OSCs has made great progress and transcended over 15% for binary OSCs. [30][31][32][33][34][35][36] Nevertheless, the value is still lagging far behind PSCs.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Role of Side‐Chain Engineering and Solvent Vapor Annealing for Binary All‐Small‐Molecule Organic Solar Cells

Chen

et al. 2022

Adv Funct Materials

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Fibrous interpenetrating network structure morphology is extremely crucial for all‐small‐molecule organic solar cells (ASM‐OSCs) in achieving high power conversion efficiency (PCE). Rational molecular design and suitable posttreatment to the film are feasible methods to accomplish this goal. Herein, two small molecule donors, namely T4 and T6, with different substituents on their selenophene conjugated units, alkyl for T4 while trialkylsilyl for T6, are developed. Both as cast devices obtain poor PCEs (≈4.5%) when blending these two donors with N3 due to the oversize phase separation. Satisfactorily, the PCEs are dramatically increased after CS2 annealing, which mainly originates from the favorable reorganization of donor and acceptor in the active layer, ultimately improving the phase separation and vertical electronic properties. As a result, the device based on trialkylsilyl‐substituted T6 acquires a remarkable PCE of 16.03%, much higher than that of the blends of alkyl‐substituted T4 and N3 (12.61%). The enhanced PCE of the T6‐based device is attributed to the deeper HOMO energy levels, more obvious fibrous interpenetrating networks, and stronger molecular interaction between T6 and N3, as compared with T4‐based ones. This study indicates that precise molecular design and the proper posttreatment process can be a brilliant approach for realizing highly efficient ASM‐OSCs.

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Ternary All‐Small‐Molecule Solar Cells with Two Small‐Molecule Donors and Y6 Nonfullerene Acceptor with a Power Conversion Efficiency over Above 14% Processed from a Nonhalogenated Solvent

Cited by 14 publications

References 76 publications

Recent progress in all-small-molecule organic photovoltaics

Recent progress in all-small-molecule organic photovoltaics

Organic Photovoltaics Utilizing Small‐Molecule Donors and Y‐Series Nonfullerene Acceptors

Deciphering the Role of Side‐Chain Engineering and Solvent Vapor Annealing for Binary All‐Small‐Molecule Organic Solar Cells

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