Isobenzofulvene-fullerene mono-adducts for organic photovoltaic applications

Tseng, Nai Wen; Yu, Yong; Li, Yun-ke; Zhao, Jingbo; So, Shu Kong; Yan, He; Ng, Ka Ming

doi:10.1039/c4tc02373k

Cited by 11 publications

(6 citation statements)

References 29 publications

(18 reference statements)

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“…Tseng et al synthesized three IC 60 MA derivatives namely: IC 60 MA-2C, IC 60 MA-3C and IC 60 MA-4C (Figure 5) with higher LUMO level than PC 61 BM and tested them in PTB7-based devices. As expected, the devices of PTB7 with ICMA derivatives all exhibited higher V oc than the reference device of PTB7:PC 61 BM [100]. However, the best PCE was still obtained with the reference PTB7:PC 61 BM devices (6.8%), while the devices with IC 60 MA-2C, IC 60 MA-3C and IC 60 MA-4C displayed PCEs of 6.0%, 5.1% and 6.5%, respectively.…”

Section: Devices Based On Ptb7supporting

confidence: 55%

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

et al. 2018

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Organic photovoltaic (OPV) devices, made with semiconducting polymers, have recently attained a power conversion efficiency (PCE) over 14% in single junction cells and over 17% in tandem cells. These high performances, together with the suitability of the technology to inexpensive large-scale manufacture, over lightweight and flexible plastic substrates using roll-to-roll (R2R) processing, place the technology amongst the most promising for future harvesting of solar energy. Although OPVs using non-fullerene acceptors have recently outperformed their fullerene-based counterparts, the research in the development of new fullerenes and in the improvement of the bulk-heterojunction (BHJ) morphology and device efficiency of polymer:fullerene solar cells remains very active. In this review article, the most relevant research works performed over the last 3 years, that is, since the year 2016 onwards, in the field of fullerene-based polymer solar cells based on the copolymers PTB7, PTB7-Th (also known as PBDTTT-EFT) and PffBT4T-2OD, are presented and discussed. This review is primarily focused on studies that involve the improvement of the BHJ morphology, efficiency and stability of small active area devices (typically < 15 mm2), through the use of different processing strategies such as the use of different fullerene acceptors, different processing solvents and additives and different thermal treatments.

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Section: Devices Based On Ptb7supporting

confidence: 55%

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

et al. 2018

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“…All the J-V curves of devices with fulleropyrrolidine acceptors show some space charge limited current (SCLC) effects, and interestingly devices based on 70A display a characteristic S-shaped similar to S-shaped J-V curves that have been previously reported in fulleropyrrolidine-based OPVs [43]. We note that previous work has often reported novel fullerenes that despite displaying more favorable LUMO levels than PC 61 BM and PC 71 BM, gave rise to OPV devices with considerable lower PCE [34,46,47,[58][59][60][61][62][63][64] and also with simultaneously lower PCE and V OC [34,46,47,[62][63][64] than reference devices based on PC 61 BM and PC 71 BM. In the present work, among our fulleropyrrolidine-based devices the best efficiencies (η) are achieved by devices with the C 60 derivatives 60A (2.78%), 60B (2.20%), and 60C (2.04%).…”

Section: Resultssupporting

confidence: 67%

Thiophene- and Carbazole-Substituted N-Methyl-Fulleropyrrolidine Acceptors in PffBT4T-2OD Based Solar Cells

et al. 2020

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The impact of fullerene side chain functionalization with thiophene and carbazole groups on the device properties of bulk-heterojunction polymer:fullerene solar cells is discussed through a systematic investigation of material blends consisting of the conjugated polymer poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3‴-di(2-octyldodecyl)-2,2′;5′,2″;5″,2‴-quaterthiophen-5,5‴-diyl)] (PffBT4T-2OD) as donor and C60 or C70 fulleropyrrolidines as acceptors. The photovoltaic performance clearly depended on the molecular structure of the fulleropyrrolidine substituents although no direct correlation with the surface morphology of the photoactive layer, as determined by atomic force microscopy, could be established. Although some fulleropyrrolidines possess favorable lowest unoccupied molecular orbital levels, when compared to the standard PC71BM, they originated OPV cells with inferior efficiencies than PC71BM-based reference cells. Fulleropyrrolidines based on C60 produced, in general, better devices than those based on C70, and we attribute this observation to the detrimental effect of the structural and energetic disorder that is present in the regioisomer mixtures of C70-based fullerenes, but absent in the C60-based fullerenes. These results provide new additional knowledge on the effect of the fullerene functionalization on the efficiency of organic solar cells.

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“…Together with the decrease of V OC and J SC for all devices (compared to the PC 71 BM) the fill-factor FF also decreases due to the mentioned J-V shape. At this point it is worth noting that a large number of previous studies in the literature have reported new fullerenes that despite exhibiting enhanced LUMO levels with respect to PC 61 BM or PC 71 BM, originated devices with considerably lower PCE [46][47][48][49][50][51][52][53][54][55] and also with simultaneously lower PCE and V OC [50][51][52][53][54][55] UV-Vis spectra of the blends and pure polymer, normalized based on the intensity of their 0-1 transition peak at~700 nm, are depicted in Figure 5. The polymer PffBT4T-2OD is the main responsible for the light absorption and the fullerenes contribute only a minor part to the total absorbance of the active layer in the visible region.…”

Section: Resultsmentioning

confidence: 99%

PffBT4T-2OD Based Solar Cells with Aryl-Substituted N-Methyl-Fulleropyrrolidine Acceptors

et al. 2019

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Novel C60 and C70 N-methyl-fulleropyrrolidine derivatives, containing both electron withdrawing and electron donating substituent groups, were synthesized by the well-known Prato reaction. The corresponding highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels were determined by cyclic voltammetry, from the onset oxidation and reduction potentials, respectively. Some of the novel fullerenes have higher LUMO levels than the standards PC61BM and PC71BM. When tested in PffBT4T-2OD based polymer solar cells, with the standard architecture ITO/PEDOT:PSS/Active-Layer/Ca/Al, these fullerenes do not bring about any efficiency improvements compared to the standard PC71BM system, however they show how the electronic nature of the different substituents strongly affects the efficiency of the corresponding organic photovoltaic (OPV) devices. The functionalization of C70 yields a mixture of regioisomers and density functional theory (DFT) calculations show that these have systematically different electronic properties. This electronic inhomogeneity is likely responsible for the lower performance observed in devices containing C70 derivatives. These results help to understand how new fullerene acceptors can affect the performance of OPV devices.

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Isobenzofulvene-fullerene mono-adducts for organic photovoltaic applications

Abstract: IC60MA derivatives with up-shifted LUMO were synthesized and their OPV devices showed higherVocthan the corresponding PC60BM based device.

Cited by 11 publications

References 29 publications

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

Thiophene- and Carbazole-Substituted N-Methyl-Fulleropyrrolidine Acceptors in PffBT4T-2OD Based Solar Cells

PffBT4T-2OD Based Solar Cells with Aryl-Substituted N-Methyl-Fulleropyrrolidine Acceptors

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