Enhanced open circuit voltage in photovoltaic effect of polycrystalline La and Ni co-doped BiFeO3 film

2015 ◽  
Vol 08 (01) ◽  
pp. 1550002 ◽  
Author(s):  
Zeng-Wei Peng ◽  
Ying-Long Wang ◽  
Bao-Ting Liu
Keyword(s):  
Indium Tin Oxide ◽  
Open Circuit Voltage ◽  
Photovoltaic Effect ◽  
Strong Dependence ◽  
Sol Gel ◽  
Open Circuit ◽  
Pt Electrode ◽  
Barrier Heights ◽  
Ito Electrode ◽  
Bifeo3 Film

Photovoltaic (PV) effect of polycrystalline Bi 0.975 La 0.025 Fe 0.975 Ni 0.025 O 3 (BLFNO) film grown on Pt (111)/ Ti/SiO 2/ Si (001) substrate using sol–gel method has been investigated. The BLFNO film possesses good ferroelectric property and large twice-remanent polarization. It is found that PV response exhibited a strong dependence on the potential of top indium tin oxide (ITO) and bottom Pt electrode. The open circuit voltage is -0.67 V when the potential of ITO electrode is higher than that of Pt electrode and 0.45 V when the potential of ITO electrode is lower than that of Pt electrode. This can be interpreted by the variation of barrier heights at both ITO/BLFNO and BLFNO/ Pt interfaces.

Thin mesoporous polyaniline films manifesting a water-promoted photovoltaic effect

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Natalia Gospodinova ◽  
Elena Tomšík ◽  
Julia Romanova
Keyword(s):  
Indium Tin Oxide ◽  
Theoretical Calculations ◽  
Photovoltaic Effect ◽  
Water Environment ◽  
Solvent Polarity ◽  
Open Circuit ◽  
Interpenetrating Network ◽  
Hydrated Ions ◽  
Polyaniline Films ◽  
Oxide Anode

AbstractPhotovoltaic cells composed of thin mesoporous polyaniline films sandwiched between an indium-tin oxide anode and aluminium cathode have been fabricated. The cells show an increase in the photo-generated open-circuit voltage (V oc) from 0.2 V to 0.6 V and stable-in-time V oc generation following the addition of water containing highly hydrated ions, e.g. tap water.We explain the waterpromoted photo-voltaic effect by the polarity of the water environment. Theoretical calculations show that increasing the solvent polarity increases the energy of the electronic transition related to the measured V oc. The stable-in-time V oc generation could be explained by the increase in the lifetime of the excitons as well as by their more efficient dissociation in the interpenetrating network of polyaniline and water. The penetration of water into the mesoporous polyaniline films is promoted by the presence of highly hydrated ions.

scholarly journals Influence of the indium tin oxide/organic interface on open-circuit voltage, recombination, and cell degradation in organic small-molecule solar cells

2011 ◽  
Vol 83 (16) ◽  
Author(s):  
Stefan Schäfer ◽  
Andreas Petersen ◽  
Thomas A. Wagner ◽  
Rolf Kniprath ◽  
Dominic Lingenfelser ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Open Circuit Voltage ◽  
Open Circuit

Preparation of Cu2ZnSnS4 Treated with Post-Sulfurization in a Sulfur Vapor Atmosphere

2011 ◽  
Vol 239-242 ◽  
pp. 642-645 ◽  
Author(s):  
Min Yen Yeh ◽  
Dong Sing Wuu
Keyword(s):  
Spin Coating ◽  
Electrical Resistance ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Sol Gel ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Sulfur Vapor ◽  
Crystallinity Degree ◽  
Composition Ratios

Cu2ZnSnS4 (CZTS) prepared by sol-gel spin-coating deposition was treated with post-sulfurization in a sulfur vapor atmosphere. The crystallinity degree of the CZTS could be significantly improved through post-sulfurization treatment. Granular structures of the CZTS as synthesized at a temperature of over 240 °C and treated with post sulfurization were obtained. The composition ratios of the as-sulfurized CZTS were close to the composition stoichiometry of CZTS with an electrical resistance of ~ 1.7 Ω cm. An as-prepared CZTS based solar cell shows an open-circuit voltage of 300 mV, and a short-circuit current of 2.48 mA cm-2.

Photovoltaic properties of ITO/p-Si heterojunction prepared by pulsed laser deposition

2020 ◽  
Vol 34 (32) ◽  
pp. 2050321
Author(s):  
Raid A. Ismail ◽  
Omar A. Abdulrazzaq ◽  
Abdullah M. Ali
Keyword(s):  
Pulsed Laser Deposition ◽  
Indium Tin Oxide ◽  
Open Circuit Voltage ◽  
Energy Gap ◽  
Short Circuit ◽  
Pulsed Laser ◽  
Open Circuit ◽  
Laser Deposition ◽  
Optical Energy Gap ◽  
Photovoltaic Properties

In this study, indium tin oxide (ITO) was deposited onto sapphire and low resistive p-Si substrates using pulsed laser deposition (PLD) technique. The optical energy gap of ITO deposited on the sapphire substrate was 3.7 eV at room temperature. Photoluminescence (PL) of ITO shows an emission of broad peak at 524 nm. Photovoltaic (PV) characteristics of the n-ITO/p-Si heterojunction are examined and showed conversion efficiency [Formula: see text] of 1.8%. The open circuit voltage [Formula: see text] for this cell was 0.49 V while the short circuit current density [Formula: see text] was 17.4 mA/cm2. The fill factor of this cell was 22%. The ideality factor of ITO/Si heterojunction is about 3.1. The barrier height [Formula: see text] of the heterojunction was determined from I–V characteristics and was 0.83 eV. The responsivity of the heterojunction was measured and the maximum value of responsivity was 0.5 A/W without bias voltage. The minority carrier lifetime of the solar was measured using open circuit voltage decay (OCVD) method and found to be 227 [Formula: see text]s.

Photovoltaic Effect in Single Layer 1H-Pyrazolo[3,4-b]quinoline and 1H-Pyrazolo[3,4-b]quioxaline/Poly(3-Decylthiophene) Polymer Cells

2009 ◽  
Vol 64 (9-10) ◽  
pp. 632-638 ◽  
Author(s):  
Ewa Gondek ◽  
Ivan V. Kityk ◽  
Andrzej Danel
Keyword(s):  
Polymer Matrix ◽  
Ground State ◽  
Open Circuit Voltage ◽  
Dipole Moments ◽  
Photovoltaic Effect ◽  
Single Layer ◽  
Open Circuit ◽  
The State ◽  
Polymer Matrices ◽  
Ground State Dipole Moments

We have explored photovoltaic (PV) reponse for the pyrazoloquinoline and pyrazoloquinoxaline dyes incorporated into the poly(3-decylthiophene) (PDT) polymer matrices. The photovoltaic response correlates generally with the enhancement of the state dipole moments. Generally we have shown that enhanced state dipole moments lead to an increase of the open circuit voltage. The surrounded polymer matrix of the polythiophene enhances the ground state dipole moments and its relative changes are decreased with the increase of the particular state dipole moments. An appearance of the three-phenyl backside groups substantially diminishes the effect.

scholarly journals A Study on the Effects of Selenization Temperature on the Properties of Na-Doped Cu2ZnSn(S,Se)4 Thin Film and Its Correlation with the Performance of Solar Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2434
Author(s):  
Zhanwu Wang ◽  
Dongyue Jiang ◽  
Fancong Zeng ◽  
Yingrui Sui
Keyword(s):  
Fill Factor ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Sol Gel ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Post Annealing ◽  
Different Temperatures ◽  
Selenization Temperature

In this study, we prepared Na-doped Cu2ZnSn(S,Se)4 [noted as (Na0.1Cu0.9)2ZnSn(S,Se)4] films on the Mo substrate using a simple and cheap sol–gel method together with the post-annealing technique. The effects of selenization temperature on the properties of Na-doped Cu2ZnSn(S,Se)4 were surveyed. The results indicated that some sulfur atoms in the films were substituted by selenium atoms by increasing the selenization temperature, and all films selenized at different temperatures had a kesterite structure. As the selenization temperature increased from 520 to 560 °C, the band gaps of the film can be tuned from 1.03 to 1 eV. The film with better morphology and opto-electrical properties can be obtained at an intermediate selenization temperature range (e.g., 540 °C), which had the lowest resistivity of 47.7 Ω cm, Hall mobility of 4.63 × 10−1 cm2/Vs, and carrier concentration of 2.93 × 1017 cm−3. Finally, the best power conversion efficiency (PCE) of 4.82% was achieved with an open circuit voltage (Voc) of 338 mV, a short circuit current density (Jsc) of 27.16 mA/cm2 and a fill factor (FF) of 52.59% when the selenization temperature was 540 °C.

scholarly journals Synthesis and Photovoltaic Effect of Electron-Withdrawing Units for Low Band Gap Conjugated Polymers Bearing Bi(thienylenevinylene) Side Chains

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1461 ◽  
Author(s):  
Jianfeng Li ◽  
Yufei Wang ◽  
Ningning Wang ◽  
Zezhou Liang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Open Circuit Voltage ◽  
Photovoltaic Effect ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Open Circuit ◽  
Photovoltaic Devices ◽  
Good Thermal Stability ◽  
Highest Occupied Molecular Orbital ◽  
Donor Acceptor

A novel (E)-5-(2-(5-alkylthiothiophen-2-yl)vinyl)thien-2-yl (TVT)-comprising benzo[1,2-b:4,5-b’]dithiophene (BDT) derivative (BDT-TVT) was designed and synthetized to compose two donor-acceptor (D-A) typed copolymers (PBDT-TVT-ID and PBDT-TVT-DTNT) with the electron-withdrawing unit isoindigo (ID) and naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT), respectively. PBDT-TVT-ID and PBDT-TVT-DTNT showed good thermal stability (360 °C), an absorption spectrum from 300 nm to 760 nm and a relatively low lying energy level of Highest Occupied Molecular Orbital (EHOMO) (−5.36 to –5.45 eV), which could obtain a large open-circuit voltage (Voc) from photovoltaic devices with PBDT-TVT-ID or PBDT-TVT-DTNT. The photovoltaic devices with ITO/PFN/polymers: PC71BM/MoO3/Ag structure were assembled and exhibited a good photovoltaic performance with a power conversion efficiency (PCE) of 4.09% (PBDT-TVT-ID) and 5.44% (PBDT-TVT-DTNT), respectively. The best PCE of a PBDT-TVT-DTNT/PC71BM-based device mainly originated from its wider absorption, higher hole mobility and favorable photoactive layer morphology.

scholarly journals Improvement of Open-Circuit Voltage in Organic Photovoltaic Cells with Chemically Modified Indium-Tin Oxide

2013 ◽  
Vol 03 (04) ◽  
pp. 113-120
Author(s):  
Khayankhyarvaa Sarangerel ◽  
Byambasuren Delgertsetseg ◽  
Namsrai Javkhlantugs ◽  
Masaru Sakomura ◽  
Chimed Ganzorig
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Open Circuit Voltage ◽  
Photovoltaic Cells ◽  
Open Circuit ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Chemically Modified
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