Enhanced performance for organic bulk heterojunction solar cells by cooperative assembly of ter(ethylene oxide) pendants

2014 ◽  
Vol 5 (15) ◽  
pp. 4480-4487 ◽  
Author(s):  
Lie Chen ◽  
Shaojie Tian ◽  
Yiwang Chen
Keyword(s):  
Solar Cells ◽  
Ethylene Oxide ◽  
Self Assembly ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
The Self ◽  
Photoactive Layer ◽  
Heterojunction Solar Cells ◽  
Donor And Acceptor ◽  
Cooperative Assembly

A ter(ethylene oxide) functionalized donor and acceptor are explored to manipulate the self-assembly morphology of the photoactive layer in polymer solar cells.

Reduced Bimolecular Recombination in Conjugated Polymer Donor/Fullerene Acceptor Bulk Heterojunction Solar Cells

2012 ◽  
Vol 65 (5) ◽  
pp. 442 ◽  
Author(s):  
Attila J. Mozer ◽  
Tracey M. Clarke
Keyword(s):  
Solar Cells ◽  
Conjugated Polymer ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Roll To Roll ◽  
Active Layers ◽  
Bimolecular Recombination

We show significantly reduced bimolecular recombination in a novel silole-based copolymer (KP115):fullerene blend, which allows the fabrication of polymer solar cells with relatively thick active layers. This leads to improved device efficiencies and makes roll-to-roll printing much easier. The origin of the reduced recombination, however, is not known. Our recent data suggest that published models are inadequate to explain this phenomenon.

scholarly journals Optimization of solution-processed oligothiophene:fullerene based organic solar cells by using solvent additives

2013 ◽  
Vol 4 ◽  
pp. 680-689 ◽  
Author(s):  
Gisela L Schulz ◽  
Marta Urdanpilleta ◽  
Roland Fitzner ◽  
Eduard Brier ◽  
Elena Mena-Osteritz ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Solution Processed ◽  
Heterojunction Solar Cells ◽  
Force Microscopy ◽  
Vacuum Technology ◽  
Atomic Force ◽  
Donor And Acceptor ◽  
Conversion Efficiencies

The optimization of solution-processed organic bulk-heterojunction solar cells with the acceptor-substituted quinquethiophene DCV5T-Bu 4 as donor in conjunction with PC61BM as acceptor is described. Power conversion efficiencies up to 3.0% and external quantum efficiencies up to 40% were obtained through the use of 1-chloronaphthalene as solvent additive in the fabrication of the photovoltaic devices. Furthermore, atomic force microscopy investigations of the photoactive layer gave insight into the distribution of donor and acceptor within the blend. The unique combination of solubility and thermal stability of DCV5T-Bu 4 also allows for fabrication of organic solar cells by vacuum deposition. Thus, we were able to perform a rare comparison of the device characteristics of the solution-processed DCV5T-Bu 4 :PC61BM solar cell with its vacuum-processed DCV5T-Bu 4 :C60 counterpart. Interestingly in this case, the efficiencies of the small-molecule organic solar cells prepared by using solution techniques are approaching those fabricated by using vacuum technology. This result is significant as vacuum-processed devices typically display much better performances in photovoltaic cells.

Efficient Small Molecule Bulk Heterojunction Solar Cells with High Fill Factors via Pyrene-Directed Molecular Self-Assembly

2011 ◽  
Vol 23 (45) ◽  
pp. 5359-5363 ◽  
Author(s):  
Olivia P. Lee ◽  
Alan T. Yiu ◽  
Pierre M. Beaujuge ◽  
Claire H. Woo ◽  
Thomas W. Holcombe ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Self Assembly ◽  
Bulk Heterojunction ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

scholarly journals Novel Terthiophene-Substituted Fullerene Derivatives as Easily Accessible Acceptor Molecules for Bulk-Heterojunction Polymer Solar Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Filippo Nisic ◽  
Alessia Colombo ◽  
Claudia Dragonetti ◽  
Alessandra Cominetti ◽  
Andrea Pellegrino ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Radiation ◽  
Band Gap ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Fullerene Derivatives ◽  
Heterojunction Solar Cells ◽  
Good Solubility ◽  
Lumo Level ◽  
Adequate Design

Five fulleropyrrolidines and methanofullerenes, bearing one or two terthiophene moieties, have been prepared in a convenient way and well characterized. These novel fullerene derivatives are characterized by good solubility and by better harvesting of the solar radiation with respect to traditional PCBM. In addition, they have a relatively high LUMO level and a low band gap that can be easily tuned by an adequate design of the link between the fullerene and the terthiophene. Preliminary results show that they are potential acceptors for the creation of efficient bulk-heterojunction solar cells based on donor polymers containing thiophene units.

scholarly journals Polymer–polymer solar cells with a near-infrared spectral response

2015 ◽  
Vol 3 (13) ◽  
pp. 6756-6760 ◽  
Author(s):  
Weiwei Li ◽  
Yang An ◽  
Martijn M. Wienk ◽  
René A. J. Janssen
Keyword(s):  
Solar Cells ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Near Infrared ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Spectral Response ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Infrared Spectral

Four different thiazole-flanked diketopyrrolopyrrole-based polymers were applied as an electron acceptor in bulk heterojunction solar cells with poly(3-hexylthiophene) as an electron donor.

Influence of Annealing of PCDTBT:PC70BM on the Performance of Polymer Solar Cells

2015 ◽  
Vol 748 ◽  
pp. 45-48
Author(s):  
Shi Yan ◽  
Long Feng Lv ◽  
Yan Bing Hou
Keyword(s):  
Solar Cells ◽  
Molecular Orbital ◽  
Energy Gap ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Low Cost ◽  
Photovoltaic Performance ◽  
Energy Difference ◽  
Large Area ◽  
Donor And Acceptor

Bulk-heterojunction polymer solar cells (BHJ-PSCs) have attracted considerable attention because of their unique advantages of lightweight, low cost, mechanical flexibility and suitable for large-area fabrication [1–3]. In the last decades, much attention has been paid to the donor and acceptor system P3HT:PCBM, However, because of the relatively large bandgap of P3HT (∼1.9 eV) and the relatively small energy difference between the lowest unoccupied molecular orbital (LUMO) of PCBM and the highest occupied molecular orbital (HOMO) of P3HT, the photovoltaic performance of the PSCs based on P3HT:PCBM is still significantly lower than the inorganic solar cells. Recently more work has been done on the novel donor materials which have a reduced energy gap with an ability of harvesting more of the sun’s spectral emission and a high charge carriers mobility for charge transport. One of the most promising new donor polymer is poly [N-9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3' -benzothiadiazole)] (PCDTBT) with a HOMO level of 5.5eV which is 0.4 eV down-shifted than that of P3HT. When PCDTBT is blended with the fullerene acceptor PC70BM, it showed excellent photovoltaic performance with a power conversion efficiency of ∼ 6%. [6]

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