scholarly journals Hybrid Lead-Halide Polyelectrolytes as Interfacial Electron Extraction Layers in Inverted Organic Solar Cells

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 743
Author(s):  
Jin Hee Lee ◽  
Yu Jung Park ◽  
Jung Hwa Seo ◽  
Bright Walker
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Hybrid Composites ◽  
Control Device ◽  
Open Circuit ◽  
Inorganic Materials ◽  
Interfacial Layers ◽  
Lead Halide

A series of lead-halide based hybrid polyelectrolytes was prepared and used as interfacial layers in organic solar cells (OSCs) to explore their effect on the energy band structures and performance of OSCs. Nonconjugated polyelectrolytes based on ethoxylated polyethylenimine (PEIE) complexed with PbX2 (I, Br, and Cl) were prepared as polymeric analogs of the perovskite semiconductors CH3NH3PbX3. The organic/inorganic hybrid composites were deposited onto Indium tin oxide (ITO) substrates by solution processing, and ultraviolet photoelectron spectroscopy (UPS) measurements confirmed that the polyelectrolytes allowed the work function of the substrates to be controlled. In addition, X-ray photoelectron spectroscopy (XPS) results showed that Pb(II) halide complexes were present in the thin film and that the Pb halide species did not bond covalently with the cationic polymer and confirmed the absence of additional chemical bonds. The composite ratio of organic and inorganic materials was optimized to improve the performance of OSCs. When PbBr2 was complexed with the PEIE material, the efficiency increased up to 3.567% via improvements in open circuit voltage and fill factor from the control device (0.3%). These results demonstrate that lead-halide based polyelectrolytes constitute hybrid interfacial layers which provide a novel route to control device characteristics via variation of the lead halide composition.

scholarly journals Relating Frontier Orbital Energies from Voltammetry and Photoelectron Spectroscopy to the Open-Circuit Voltage of Organic Solar Cells

2019 ◽  
Vol 9 (10) ◽  
pp. 1803677 ◽  
Author(s):  
Robin E. M. Willems ◽  
Christ H. L. Weijtens ◽  
Xander de Vries ◽  
Reinder Coehoorn ◽  
René A. J. Janssen
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Frontier Orbital ◽  
Orbital Energies

scholarly journals Water-Processed Organic Solar Cells with Open-Circuit Voltages Exceeding 1.3V

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 421
Author(s):  
Varun Vohra ◽  
Shunsuke Shimizu ◽  
Yuko Takeoka
Keyword(s):  
Electron Donor ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Molybdenum Trioxide ◽  
Short Circuit ◽  
Open Circuit ◽  
Hole Transport ◽  
Water Soluble ◽  
Active Layers

Conjugated polyelectrolytes are commonly employed as interlayers to modify organic solar cell (OSC) electrode work functions but their use as an electron donor in water-processed OSC active layers has barely been investigated. Here, we demonstrate that poly[3-(6’-N,N,N-trimethyl ammonium)-hexylthiophene] bromide (P3HTN) can be employed as an electron donor combined with a water-soluble fullerene (PEG-C60) into eco-friendly active layers deposited from aqueous solutions. Spin-coating a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) layer prior to the P3HTN:PEG-C60 active layer deposition considerably increases the open-circuit voltage (Voc) of the OSCs to values above 1.3 V. Along with this enhanced Voc, the OSCs fabricated with the PEDOT:PSS interlayers exhibit 10-fold and 5-fold increases in short-circuit current density (Jsc) with respect to those employing bare indium tin oxide (ITO) and molybdenum trioxide coated ITO anodes, respectively. These findings suggest that the enhanced Jsc and Voc in the water-processed OSCs using the PEDOT:PSS interlayer cannot be solely ascribed to a better hole collection but rather to ion exchanges taking place between PEDOT:PSS and P3HTN. We investigate the optoelectronic properties of the newly formed polyelectrolytes using absorption and photoelectron spectroscopy combined with hole transport measurements to elucidate the enhanced photovoltaic parameters obtained in the OSCs prepared with PEDOT:PSS and P3HTN.

Temperature dependence of HOMO-LUMO levels and open circuit voltage for P3HT:PCBM organic solar cells

2011 ◽  
Vol 1360 ◽  
Author(s):  
Yang Shen ◽  
Louis Scudiero ◽  
Mool C. Gupta
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Temperature Dependence ◽  
Organic Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Open Circuit Voltage ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Open Circuit ◽  
Temperature Range

ABSTRACTIn this study, the open circuit voltage (VOC) of poly (3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) bulk heterojunction (BHJ) organic solar cells was measured at temperatures ranging from 300 K to 400 K. The temperature dependence of the vacuum shift and of the highest occupied molecular orbital (HOMO) energy level of P3HT and PCBM were measured by ultraviolet photoelectron spectroscopy (UPS) in the same temperature range. The temperature dependence of the absorption edge was also studied in the same temperature range to obtain the temperature variation of the optical band gap energy (Eg). The measured VOC of the devices showed a clear decreasing trend with increasing operating temperature and the total decrease was found to be about 0.1 V. Although the origin of VOC is still not fully understood it is generally believed that the energy level offset between the HOMO of the donor and the LUMO of the acceptor minus the exciton binding energy (0.3 eV) directly determines the value of VOC. However, by utilizing the measured values of the HOMO for the P3HT (donor) and of the LUMO for the PCBM (acceptor), we have found that the calculated values of VOC and its temperature dependence do not agree with the measured VOC values. This indicates that factors other than the offset between the HOMO of the donor and the LUMO of the acceptor materials are impacting VOC.

scholarly journals Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 763
Author(s):  
Elisa Lassi ◽  
Benedetta Maria Squeo ◽  
Roberto Sorrentino ◽  
Guido Scavia ◽  
Simona Mrakic-Sposta ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Acid Methyl Ester ◽  
Silver Electrode ◽  
Solution Processed ◽  
Interfacial Layers ◽  
Functional Behavior ◽  
Oxide Electrodes ◽  
Good Energy

Conjugated polymers with ionic pendant groups (CPEs) are receiving increasing attention as solution-processed interfacial materials for organic solar cells (OSCs). Various anionic CPEs have been successfully used, on top of ITO (Indium Tin Oxide) electrodes, as solution-processed anode interlayers (AILs) for conventional devices with direct geometry. However, the development of CPE AILs for OSC devices with inverted geometry is an important topic that still needs to be addressed. Here, we have designed three anionic CPEs bearing alkyl-potassium-sulfonate side chains. Their functional behavior as anode interlayers has been investigated in P3HT:PC61BM (poly(3-hexylthiophene): [6,6]-phenyl C61 butyric acid methyl ester) devices with an inverted geometry, using a hole collecting silver electrode evaporated on top. Our results reveal that to obtain effective anode modification, the CPEs’ conjugated backbone has to be tailored to grant self-doping and to have a good energy-level match with the photoactive layer. Furthermore, the sulfonate moieties not only ensure the solubility in polar orthogonal solvents, induce self-doping via a right choice of the conjugated backbone, but also play a role in the gaining of hole selectivity of the top silver electrode.

Importance of interfacial crystallinity to reduce open-circuit voltage loss in organic solar cells

2019 ◽  
Vol 115 (15) ◽  
pp. 153301 ◽  
Author(s):  
Seiichiro Izawa ◽  
Naoto Shintaku ◽  
Mitsuru Kikuchi ◽  
Masahiro Hiramoto
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Voltage Loss

scholarly journals Facile synthesis and photovoltaic applications of a new alkylated bismethano fullerene as electron acceptor for high open circuit voltage solar cells

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64724-64730 ◽  
Author(s):  
Derya Baran ◽  
Sule Erten-Ela ◽  
Andreas Kratzer ◽  
Tayebeh Ameri ◽  
Christoph J. Brabec ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Acceptor ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Facile Synthesis ◽  
Photovoltaic Applications ◽  
Lumo Level

In this work, a bis-adduct C60 derivative was facilely synthesized using an alkyl solubilizing group. This semiconductor offers a higher LUMO level compared to PCBM, which resulted in a significantly enhanced Voc of 0.73 V in organic solar cells.

Impact of mesoscale order on open-circuit voltage in organic solar cells

2014 ◽  
Vol 14 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Carl Poelking ◽  
Max Tietze ◽  
Chris Elschner ◽  
Selina Olthof ◽  
Dirk Hertel ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit

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.

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