Non-fused ring acceptors for organic solar cells

Yang, Mingqun; Wu, Wei; Zhou, Xia; Wang, Zhiqiang; Duan, Chunhui

doi:10.20517/energymater.2021.08

Cited by 81 publications

(77 citation statements)

References 66 publications

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“…Organic solar cells (OSCs) based on the bulk heterojunction (BHJ) concept have attracted more and more attention during the last two decades, owing to their advantages of low cost, light weight, high flexibility, and easy to manufacture [1][2][3] . The power conversion efficiency (PCE) of OSCs has been improved rapidly since the development of non-fullerene acceptor (NFA) materials 4,5 . Today, the highest PCE values reported for OSCs based on the NFA are over 18% [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

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

Xu¹,

Wu²,

Liang³

et al. 2022

Acta Physico Chimica Sinica

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From the industrial perspective, poly(3-hexylthiophene) (P3HT) is one of the most attractive donor materials in organic photovoltaics. The large bandgap in P3HT makes it particularly promising for efficient indoor light harvesting, a unique advantage of organic photovoltaic (PV) devices, and this has started to gain considerable attention in the field of PV technology. In addition, the up-scalability and long material stability associated with the simple chemical structure make P3HT one of the most promising materials for the mass production of organic solar cells. However, the solar cells based on P3HT has a low power conversion efficiency (PCE), which is less than 11%, mainly due to significant voltage losses. In this study, we identified the origin of the high quantum efficiency and voltage losses in the P3HT:non-fullerene based solar cells, and we proposed a strategy to reduce the losses. More specifically, we observed that: 1) the non-radiative decay rate of the charge transfer (CT) states formed at the donor-acceptor interfaces was much higher for the P3HT:nonfullerene solar cells than that for the P3HT:fullerene solar cells, which was the main reason for the more severely limited photovoltage; 2) the origin of the high non-radiative decay rate in the P3HT:non-fullerene solar cell could be ascribed to the short packing distance between the P3HT and non-fullerene acceptor molecules at the donor-acceptor interfaces (DA distance), which is a rarely studied interfacial structural property, highly important in determining the decay rate of CT states; 3) the lower voltage loss in the state-of-the-art P3HT solar cell based on the 2,2'- ((12,13-bis(2-butyldecyl)-3,9diundecyl-12,13-dihydro-[1,2,5]-thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]p-yrolo[3,2-g]thieno [2',3':4,5]thieno [3,2b]indole-2,10-diyl)bis(methanelylidene))bis(5,6-dichloro-1H-indene-1,3(2H)-dion-e) (ZY-4Cl) acceptor could be associated with the better alignment of the energy levels of the active materials and the longer DA distance, compared to those based on the commonly used acceptors. However, the DA distance was still very short, limiting the device voltage. Thus, improving the performance of the P3HT based solar cells requires a further increase in the DA distance. Our findings are expected to pave the way for breaking the performance bottleneck of the P3HT based solar cells.

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Section: Introductionmentioning

confidence: 99%

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

Xu¹,

Wu²,

Liang³

et al. 2022

Acta Physico Chimica Sinica

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“…Among different types of solar cells, polymer solar cells (PSCs) have the advantages of flexibility, lightweight, low cost, and simple manufacturing process, which make them one of the potential clean technologies. [1][2][3][4][5] Many approaches have been applied to improve the performance and lifetime of PSCs, including molecular design and synthesis, [6][7][8][9][10][11][12] morphology control, [13][14][15][16][17] interface engineering, [18][19][20] device engineering, [21][22][23][24][25][26] and so on. The power conversion efficiencies (PCEs) of single-junction and tandem PSCs currently have increased over 18% 24,[27][28][29][30][31] and over 20% 32 (AM 1.5G) respectively with reported device lifetimes ranging from months to several years.…”

Section: Introductionmentioning

confidence: 99%

Self‐assembled monolayers for interface engineering in polymer solar cells

Yang³

et al. 2022

Journal of Polymer Science

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Polymer solar cell (PSC) has been developed vastly in the past decade due to the advantages of low cost, lightweight, mechanical flexibility, versatility of chemical design and synthesis, semitransparency, and solution processing. The performance and lifetime of PSCs are highly dependent on the properties of both active materials and their interfaces. The combination of the versatility of organic chemistry and the multitude of well-understood ligand-metal interactions allows self-assembled monolayers (SAMs) of organic molecules to direct control over the electronic and chemical properties at the inorganic-organic interfaces. Thus, SAMs are an attractive pathway to reconcile interfaces with tunable interface properties in PSCs. Hence, this review describes the application of SAMs in PSCs at different interfaces. First, SAMs as alternatives of traditional transporting materials to reduce the barrier at indium tin oxide (ITO)/ active layer interface due to the ability of tuning work function of ITO electrode are discussed. Second, the modifications of metal oxide by SAMs to control the electrical contacts at transporting layer/active layer interface are described. Third, tailoring the properties of the donor/acceptor interface by SAMs to improve the performance of PSCs are summarized. Finally, perspectives and challenges are pointed out for developing highly stable and highperformance PSCs by applying SAMs.

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“…44,46,49,50 However, OSCs based on non-fused NFAs are still being developed because of the moderate short-circuit current density (J SC ) and ll factor (FF) of OSC characteristics. 40,51 To overcome this problem, the development of new non-fused NFAs is important to establish the guidelines for molecular design. Along this line, it is also essential to clarify the effect of the exibility of non-fused NFA on the dynamic carrier generation and extraction processes in OSCs.…”

Section: Introductionmentioning

confidence: 99%