Deformation and Failure of Bendable Organic Solar Cells

2015 ◽  
Vol 1132 ◽  
pp. 116-124 ◽  
Author(s):  
Joseph Asare ◽  
B. Agyei-Tuffour ◽  
O.K. Oyewole ◽  
G.M. Zebaze-Kana ◽  
W.O. Soboyejo
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Visible Spectrum ◽  
Optical Transmittance ◽  
Hole Injection ◽  
Deformation And Failure ◽  
Organic Layers

This research investigates the effects of bending on the electrical, optical, structural and mechanical properties of flexible organic photovoltaic (OPV) cells. Bulk heterojunction organic solar cells were fabricated on Polyethylene terephthalate (PET) substrates using Poly-3-hexylthiophene: [6, 6]-phenyl-C61-butyric acid methyl ester (P3HT: PCBM) as the active layer and Poly (3, 4-ethylenedioxythiophene) Polystyrenesulfonate (PEDOT: PSS) as the hole injection layer. All the organic layers were deposited by spin coating while the Al cathode was vacuum thermally evaporated. The Indium Tin Oxide (ITO) anode has an average optical transmittance of 85% in the visible spectrum, a sheet resistivity of 60 ohms per square and an average surface roughness of 3nm. The relationship between the optoelectronic performance of the various device layers and the applied mechanical strains has been analyzed. The effects of stress and strain on the current-voltage characteristics of the device and its failure were modeled using the Abaqus software.

Ag Doped Zinc Tin Oxide as Cathode for Organic Photovoltaic Cells

2012 ◽  
Vol 209-211 ◽  
pp. 1719-1722
Author(s):  
Ming Guo Zhang ◽  
Nan Hai Sun
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Indium Tin Oxide Electrode ◽  
Heterojunction Solar Cells ◽  
Visible Part ◽  
Cell Architecture ◽  
Zinc Tin Oxide

A thin Ag layer embedded between layers of zinc tin oxide (ZTO) are compared to cells using an indium tin oxide electrode was investigated for inverted organic bulk heterojunction solar cells employing a multilayer electrode. ZTO/Ag/ ZTO (ZAZ) electrode is the preparation at room temperature, a high transparency in the visible part of the spectrum, and a very low sheet resistance comparable to treated ITO without the need for any thermal post deposition treatment as it is necessary for ITO. The In-free ZAZ electrodes exhibit a favorable work function of 4.3 eV and are shown to allow for excellent electron extraction even without a further interlayer. This renders ZAZ a perfectly suited bottom electrode for inverted organic solar cells with simplified cell architecture.

scholarly journals Polyethylenimine-Ethoxylated Interfacial Layer for Efficient Electron Collection in SnO2-Based Inverted Organic Solar Cells

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 731
Author(s):  
Ikram Anefnaf ◽  
Safae Aazou ◽  
Guy Schmerber ◽  
Siham Refki ◽  
Nicolas Zimmermann ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Tin Dioxide ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Cathode Layer ◽  
Acid Methyl ◽  
Electron Collection ◽  
Cathode Buffer Layer ◽  
20 Nm

In this work, we studied inverted organic solar cells based on bulk heterojunction using poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C71-butyric acid methyl ester (P3HT:PCBM) as an active layer and a novel cathode buffer bilayer consisting of tin dioxide (SnO2) combined with polyethylenimine-ethoxylated (PEIE) to overcome the limitations of the single cathode buffer layer. The combination of SnO2 with PEIE is a promising approach that improves the charge carrier collection and reduces the recombination. The efficient device, which is prepared with a cathode buffer bilayer of 20 nm SnO2 combined with 10 nm PEIE, achieved Jsc = 7.86 mA/cm2, Voc = 574 mV and PCE = 2.84%. The obtained results exceed the performances of reference solar cell using only a single cathode layer of either SnO2 or PEIE.

Roll-to-Roll Fabrication of Bulk Heterojunction Plastic Solar Cells using the Reverse Gravure Coating Technique

2008 ◽  
Vol 1091 ◽  
Author(s):  
Daniel Tobjork ◽  
Harri Aarnio ◽  
Tapio Mäkelä ◽  
Ronald Österbacka
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Ambient Air ◽  
Plastic Substrate ◽  
Heterojunction Solar Cells ◽  
Coating Technique ◽  
Roll To Roll ◽  
Poly Styrene Sulfonate

AbstractThe roll-to-roll reverse gravure (RG) coating technique was used to produce thin homogeneous films (∼100 nm) for organic bulk heterojunction solar cells. The conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and the active layer regioregular poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) were successfully subsequently RG coated on an ITO covered plastic substrate in ambient air. Working solar cells were achieved after annealing and thermal evaporation of the top contact. The AM1.5 power conversion efficiency (PCE) of the RG coated organic solar cells was determined to 0.74% (at 100 mW/cm2). This was very similar to the results of a reference device that was spin coated on a glass substrate in a nitrogen glove box.

A mono(carboxy)porphyrin-triazine-(bodipy)2triad as a donor for bulk heterojunction organic solar cells

2015 ◽  
Vol 3 (24) ◽  
pp. 6209-6217 ◽  
Author(s):  
Ganesh D. Sharma ◽  
S. A. Siddiqui ◽  
Agapi Nikiforou ◽  
Galateia E. Zervaki ◽  
Irene Georgakaki ◽  
...  
Keyword(s):  
Solar Cells ◽  
Methyl Ester ◽  
Butyric Acid ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Solution Processed ◽  
Acid Methyl ◽  
Butyric Acid Methyl Ester

A mono(carboxy)porphyrin-triazine-(bodipy)2triad(PorCOOH)(BDP)2has been used as a donor with ([6,6]-phenyl C71butyric acid methyl ester) (PC71BM) as an acceptor, in BHJ - solution processed organic solar cells.

Iodine Doping Studies on Nonannealed Perylene 3,4,9,10-Tetra Carboxylic Dianhydride/Cobalt Phthalocyanine Bulk Heterojunction Solar Cells

2013 ◽  
Vol 1 ◽  
pp. 194308921350702 ◽  
Author(s):  
Priya A. Hoskeri ◽  
Gayathri A. G. ◽  
Ayachit N. H. ◽  
Joseph C. M.
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Cobalt Phthalocyanine ◽  
Iodine Doping ◽  
Heterojunction Solar Cells ◽  
Cell Parameters ◽  
Glass Substrates

Perylene 3,4,9,10-tetra carboxylic dianhydride (PTCDA) thin films find a lot of optoelectronic applications. In this work, thin films of PTCDA were deposited using vacuum evaporation technique onto clean glass substrates and the variation in conductivity, optical bandgap and percentage transmission due to iodine doping for different time intervals are discussed. To study the doping effects on devices, organic solar cells based on cobalt phthalocyanine (CoPc)/PTCDA as active layers on indium tin oxide–coated glass substrates were fabricated and characterized to evaluate the solar cell parameters. It was found that doping with iodine considerably increases the power conversion efficiency of the solar cells.

Three-Dimensional Nanostructured Indium-Tin-Oxide Electrodes for Enhanced Performance of Bulk Heterojunction Organic Solar Cells

2014 ◽  
Vol 4 (7) ◽  
pp. 1301566 ◽  
Author(s):  
Hyunah Kwon ◽  
Juyoung Ham ◽  
Dong Yeong Kim ◽  
Seung Jae Oh ◽  
Subin Lee ◽  
...  
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Three Dimensional ◽  
Oxide Electrodes

Fabrication and characterization of polysilane: PCBM bulk heterojunction solar cells

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Kazumi Yoshida ◽  
Takeo Oku ◽  
Atsushi Suzuki ◽  
Tsuyoshi Akiyama ◽  
Katsuhisa Tokumitsu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Oxide Electrodes ◽  
Coating Method ◽  
And Performance ◽  
Conversion Efficiencies

AbstractPolysilane/fullerene bulk heterojunction solar cells were fabricated on indium tin oxide electrodes by a spin-coating method, and performance and microstructures of the solar cells were investigated. Decaphenylcyclopentasilane (PDPS), polymethlyphenylsilane (PMPS) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) were used for the solar cells. The conversion efficiencies of PDPS:PCBM solar cells were higher than those of PMPS:PCBM devises. Transmission electron microscopy and X-ray diffraction indicated that PDPS:PCBM layer had a nanocomposite structure.

scholarly journals A-D-A-Type Oligothiophenes Containing Benzothiadiazole Terminal Units for Small Molecule Organic Solar Cells

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Simon Steinberger ◽  
Amaresh Mishra ◽  
Gisela Schulz ◽  
Christian Uhrich ◽  
Martin Pfeiffer ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Visible Spectrum ◽  
Photovoltaic Properties ◽  
Acceptor Group ◽  
Moderate Power ◽  
Conversion Efficiencies ◽  
Homo Lumo

AbstractThe electron-deficient, fused-heterocyclebenzo[c][1,2,5]thiadiazole (BTDA) is investigated as acceptor group in A-D-A-type oligothiophenes in order to correlate their relative acceptor strength with opto-electronic and photovoltaic properties. In this respect, two novel BDTA-capped oligothiopheneswere synthesized and characterized by optical and electrochemical measurements. They showed broad absorptions in the visible spectrum and HOMO-LUMO energies well suited for organic solar cells. The attachment of terminal BTDA acceptor units to the conjugated oligothiophene backbone resulted in a hypsochromic shift in UV-Vis absorption and larger band gap in comparison to previously reported analogous dicyanovinylene (DCV)-substituted oligothiophenes indicating that BDTA is a weaker acceptor than DCV. Vacuumprocessed m-i-p (metal-intrinsic-p-doped)-type bilayer solar cells using these co-oligomers as donor and C60 as acceptor gave moderate power conversion efficiencies of around 1.0%. Bulk-heterojunction (BHJ) solar cells prepared by solution-processing using fullerene PC61BM as acceptor generated slightly lower efficiencies of 0.9%, whichwere increased to 1.5% by using the higher fullerene PC71BM. It was found that the cell efficiencies were mostly limited by the low photocurrent densities due to moderate light absorption in the bilayer devices and low fill factors coming from inefficient charge transport in the solutionprocessed BHJ devices.

Effects of Deformation on Failure Mechanisms and Optical Properties of Flexible Organic Solar Cell Structures

2015 ◽  
Vol 1132 ◽  
pp. 125-143 ◽  
Author(s):  
J. Asare ◽  
B. Agyei-Tuffour ◽  
O.K. Oyewole ◽  
V.C. Anye ◽  
D.Y. Momodu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Driving Forces ◽  
Acid Methyl Ester ◽  
Deformation And Failure ◽  
Cell Structures ◽  
Cracking Mechanisms ◽  
The Individual ◽  
Flexible Organic Solar Cells

This paper examines the effects of cyclic bending on the deformation and failure of layers that are relevant to flexible organic solar cells (with Polyethylene Terephthalate (PET) substrates and Poly-3-hexylthiophene: [6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) active layers). The deformation and cracking mechanisms are elucidated along with the stresses and crack driving forces associated with the bending of flexible organic solar cells. The changes in the optical properties (transmittance) of the individual layers and multilayers are then explored for layers/multilayers deformed to flexural strains and stresses that are computed using finite element models. The implications of the results are then discussed for the design of flexible organic solar cells.

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