A non-fullerene all small molecule solar cell constructed with a diketopyrrolopyrrole-based acceptor having a power conversion efficiency higher than 9% and an energy loss of 0.54 eV

Privado, María; Cruz, Pilar de la; Biswas, Shyamal; Singhal, Rahul; Sharma, Ganesh D.; Langa, Fernando

doi:10.1039/c8ta02633e

Cited by 49 publications

(43 citation statements)

References 89 publications

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“…For example, Hou and co‐workers have recently demonstrated high J sc over 18 mA cm −2 in NFSM‐OSCs by combining a slightly lower bandgap acceptor, IT‐4F ( E g = 1.52 eV) with a mid‐bandgap donor . However, the photoresponse for all of the high performing NFSM‐OSCs reported so far are below 820 nm, which limits the potential to further increase J sc . Considering that near‐infrared (NIR) nonfullerene acceptors ( E g < 1.4 eV) have been widely used in NFP‐OSCs to achieve high J sc of >23 mA cm −2 , it is rational to apply similar NIR absorbing acceptor/donor to NFSM‐OSCs.…”

Section: Photovoltaic Parameters For Znp‐tbo:6tic Devices With Differmentioning

confidence: 99%

Over 12% Efficiency Nonfullerene All‐Small‐Molecule Organic Solar Cells with Sequentially Evolved Multilength Scale Morphologies

et al. 2019

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mobility. [18] However, P-OSCs have a drawback in batch-to-batch reproducibility of donor polymers, which potentially limits the mass deployment of OSCs. [19] Compared to P-OSCs, small-molecule based OSCs (SM-OSCs) are more attractive in commercialization because of well-defined molecular structures, [20][21][22] simpler synthesis and purification, [23][24][25] and low batch-to-batch variations. [26][27][28][29] With the SM donors developed, the state-of-the-art SM-OSCs show similar PCEs as those obtained for P-OSCs (over 11%) using fullerene derivative, PCBM, as the electron acceptor. [19,[30][31][32][33] However, when the NFSM acceptors were used in nonfullerene-based small molecule organic solar cells (NFSM-OSCs) their PCE can only reach slightly over 10% [34][35][36][37] which is much lower than those obtained for nonfullerene polymer solar cells (NFP-OSCs) with usually PCE over 13%. [38,39] The progress of NFSM-OSCs is strongly lagged behind their polymer counterparts.The PCE of an OSC is determined by three parameters, opencircuit voltage (V oc ), short-circuit current density (J sc ), and fill factor (FF). The main reason for the low PCE in NFSM-OSCs is due to their relative low J sc and FF. [40,41] As shown in Table S1 (Supporting Information), all of the efficient NFP-OSCs with PCE over 14% show high J sc (>20 mA cm −2 ) and high FF In this paper, two near-infrared absorbing molecules are successfully incorporated into nonfullerene-based small-molecule organic solar cells (NFSM-OSCs) to achieve a very high power conversion efficiency (PCE) of 12.08%. This is achieved by tuning the sequentially evolved crystalline morphology through combined solvent additive and solvent vapor annealing, which mainly work on ZnP-TBO and 6TIC, respectively. It not only helps improve the crystallinity of the ZnP-TBO and 6TIC blend, but also forms multilength scale morphology to enhance charge mobility and charge extraction. Moreover, it simultaneously reduces the nongeminate recombination by effective charge delocalization. The resultant device performance shows remarkably enhanced fill factor and J sc . These result in a very respectable PCE, which is the highest among all NFSM-OSCs and all small-molecule binary solar cells reported so far.

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Section: Photovoltaic Parameters For Znp‐tbo:6tic Devices With Differmentioning

confidence: 99%

Over 12% Efficiency Nonfullerene All‐Small‐Molecule Organic Solar Cells with Sequentially Evolved Multilength Scale Morphologies

et al. 2019

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“…48 Light intensity (P) dependence of Jsc and Voc were plotted to evaluate the recombination processes in the binary OSCs. 49 Normally, the relationship of P and Jsc can be defined as Jsc ∝ P S , and the bimolecular recombination in the devices are negligible when S value is close to 1. 50 As shown in Figure 3a, the slope for IPIC-4Cl…”

Section: Tocmentioning

confidence: 99%

Nonfullerene Acceptor for Organic Solar Cells with Chlorination on Dithieno[3,2-b:2′,3′-d]pyrrol Fused-Ring

et al. 2019

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A narrow bandgap molecular acceptor, IPIC-4Cl, featuring an indacenobis(dithieno[3,2-b:2ʹ,3ʹ-d]pyrrol) (INP) core with 2-butyl-1-octyl sidechains and chlorinated (dicyanomethylidene)-indan-1-one (IC) as electron-accepting endgroup, has been rationally designed as non-fullerene acceptors (NFAs) for organic solar cells (OSCs). The impact of chlorination on the acceptor unit is revealed by a comparison study with two counterpart NFAs bearing fluorinated or non-halogenated IC unit. The synergetic photophysical and morphological analyses reveal that PBDB-T:IPIC-4Cl blend possesses efficient exciton dissociation and charge collection integrated with higher crystallinity and optimized phase separation. Consequently, the OSCs constructed by PBDB-T:IPIC-4Cl obtain a champion power conversion efficiency (PCE) of 13.4% with an extremely low energy loss of 0.51 eV. More encouragingly, we achieve a higher photovoltaic performance of 14.3% for ternary solar cells by using a combination of optimal amount of PC71BM with PBDB-T:IPIC-4Cl blend. 3 TOC Organic solar cells (OSCs) have emerged as one of the promising photovoltaic technology, owing to their superior performance and capacity for low-cost and scalable solution-processing fabrication. 1-6 In comparison with traditional fullerene-based electron acceptor, the non-fullerene acceptors (NFAs) with acceptor-donor-acceptor (A-D-A) structure exhibited significant advantages, such as variability of energy levels and 4 absorption range, strong absorption strength and adjustable chemical structure. Among the families of NFA small molecule, the fused-ring electron-acceptors (FREAs) have achieved dramatic progress in realizing high-performance bulk-heterojunction (BHJ) OSCs. 7-14 The power conversion efficiencies (PCEs) of the single-junction OSCs based on FREAs were boosted to 15.7 % as a result of optimization of the central core units, electron-withdrawing terminal groups, and the sidechain in core units. 15-18 Moreover, in combination with tandem cell architecture, the photovoltaic performance containing FREAs can further be improved to over 17%. 19 Rational design and synthesis of novel FREA as well as relationship of their structure-to-performance (especially the energetic loss (Eloss, Eloss = Eg opt -eVoc, Eg opt : opticl bandgap, Voc: open-circuited voltage) vs the short-circuited current densities (Jsc)) are indispensable to develop highly efficient OSCs for real-world application. 20-22 Summarizing the literature about FREA, benefitting from the well-balanced feature between open-circuited voltage (Voc) and Jsc, FREA material with bandgap between

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“…In order to further understand the charge carrier recombination processes in the PSCs, the variation of J sc with illumination intensity was measured [ 50,51 ] and shown in Figure , which shows the relationship as J sc ∝( P in ) α , where exponent α denotes the degree of bimolecular recombination. The value of α for P1‐ based PSC is about 0.968, which is higher than that of P2 counterpart (0.952), suggesting that there is less bimolecular recombination in P1 as compared to P2 , supporting higher values of J sc and FF for the P1 ‐based PSC.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Wide‐Bandgap Conjugated Polymers Consisting of Same Electron Donor and Different Electron‐Deficient Units and Their Application for Nonfullerene Polymer Solar Cells

Кештов

Kuklin

Константинов

et al. 2020

Macro Chemistry & Physics

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Substantial development has been made in nonfullerene small molecule acceptors (NFSMAs) that has resulted in a significant increase in the power conversion efficiency (PCE) of nonfullerene‐based polymer solar cells (PSCs). In order to achieve better compatibility with narrow‐bandgap nonfullerene small molecule acceptors, it is important to design the conjugated polymers with a wide bandgap that has suitable molecular orbital energy levels. Here two donor–acceptor (D–A)‐conjugated copolymers are designed and synthesized with the same thienyl‐substituted benzodithiophene and different acceptors, i.e., poly{(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl)‐alt‐(1,3‐bis(2‐octyldodecyl)‐1,3‐dihydro‐2H‐dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2‐d]imidazol‐2‐one‐5,8‐diyl)} (DTBIA, P1) and poly{(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl)‐alt‐(2‐(5‐(3‐octyltridecyl)thiophen‐2‐yl)dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2‐d]thiazole‐5,8‐diyl)} (TDTBTA, P2) (and their optical and electrochemical properties are investigated). Both P1 and P2 exhibit similar deeper highest occupied molecular orbital energy level and different lowest unoccupied molecular orbital energy level. Both the copolymers have complementary absorption with a well‐known nonfullerene acceptor ITIC‐F. When blended with a narrow‐bandgap acceptor ITIC‐F, the PSCs based on P1 show a power conversion efficiency of 11.18% with a large open‐circuit voltage of 0.96 V, a Jsc of 16.89 mA cm−2, and a fill factor (FF) of 0.69, which is larger than that for P2 counterpart (PCE = 9.32%, Jsc = 15.88 mA cm−2, Voc = 0.91 V, and FF = 0.645). Moreover, the energy losses for the PSCs based on P1 and P2 are 0.54 and 0.59 eV, respectively. Compared to P2, the P1‐based PSCs show high values of incident photon to current conversion efficiency (IPCE) in the shorter‐wavelength region (absorption of donor copolymer), more balanced hole and electron mobilities, and favorable phase separation with compact π–π stacking distance.

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A non-fullerene all small molecule solar cell constructed with a diketopyrrolopyrrole-based acceptor having a power conversion efficiency higher than 9% and an energy loss of 0.54 eV

Abstract: A non-fullerene all small molecule solar cell constructed with a new diketopyrrolopyrrole-based acceptor shows an efficiency of 9.14% and energy loss of 0.54 eV.

Cited by 49 publications

References 89 publications

Over 12% Efficiency Nonfullerene All‐Small‐Molecule Organic Solar Cells with Sequentially Evolved Multilength Scale Morphologies

Over 12% Efficiency Nonfullerene All‐Small‐Molecule Organic Solar Cells with Sequentially Evolved Multilength Scale Morphologies

Nonfullerene Acceptor for Organic Solar Cells with Chlorination on Dithieno[3,2-b:2′,3′-d]pyrrol Fused-Ring

Synthesis and Characterization of Wide‐Bandgap Conjugated Polymers Consisting of Same Electron Donor and Different Electron‐Deficient Units and Their Application for Nonfullerene Polymer Solar Cells

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