The Influence of the Fullerene on the Optical Constants of the Photoactive Blend Film of a Polymer Solar Cell

2010 ◽  
Vol 74 ◽  
pp. 164-169 ◽  
Author(s):  
Pasquale Morvillo ◽  
Eugenia Bobeico ◽  
Salvatore Esposito
Keyword(s):  
Solar Cell ◽  
Optical Constants ◽  
Polymer Solar Cell ◽  
Polymer Solar Cells ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Device Structure ◽  
Current Output ◽  
Blend Film

The short circuit current density (Jsc) of polymer solar cells is strictly related to the absorption of the blend film. Recently it has been shown that the use of [70]PCBM as electron acceptor can improve the current output of such devices because C70 derivatives have a stronger and broader absorption compared to C60 ones. The aim of this work is to study the influence of the fullerene on the optical behaviour of the photoactive blend film of a polymer solar cell. We have determined the optical constants of a P3HT:[70]PCBM blend film and studied their variation as a function of the annealing temperature. Afterward, we simulated the optical absorption of the active layer inside the device structure and calculated the maximum achievable Jsc with the aim to correlate the variation of the optical constants to the device output current. We compared this value with that one obtained using a P3HT:[60]PCBM blend.

Room-Temperature Wafer Bonded Multi-Junction Solar Cell Grown by Solid State Molecular Beam Epitaxy

MRS Advances ◽  
2016 ◽  
Vol 1 (43) ◽  
pp. 2907-2916 ◽  
Author(s):  
Shulong Lu ◽  
Shiro Uchida
Keyword(s):  
Solar Cell ◽  
Molecular Beam Epitaxy ◽  
Wafer Bonding ◽  
Room Temperature ◽  
Molecular Beam ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Device Structure ◽  
Junction Solar Cell

ABSTRACTWe studied the InGaP/GaAs//InGaAsP/InGaAs four-junction solar cells grown by molecular beam epitaxy (MBE), which were fabricated by the novel wafer bonding. In order to reach a higher conversion efficiency at highly concentrated illumination, heat generation should be minimized. We have improved the device structure to reduce the thermal and electrical resistances. Especially, the bond resistance was reduced to be the lowest value of 2.5 × 10-5 Ohm cm2 ever reported for a GaAs/InP wafer bond, which was obtained by the specific combination of p+-GaAs/n-InP bonding and by using room-temperature wafer bonding. Furthermore, in order to increase the short circuit current density (Jsc) of 4-junction solar cell, we have developed the quality of InGaAsP material by increasing the growth temperature from 490 °C to 510 °C, which leads to a current matching. In a result, an efficiency of 42 % at 230 suns of the four-junction solar cell fabricated by room-temperature wafer bonding was achieved.

Effect of PMMA and Graphene Addition on the Performances of Organic Solar Cells

2013 ◽  
Vol 805-806 ◽  
pp. 1235-1239 ◽  
Author(s):  
Cheng Fang Ou ◽  
Pei Yun Chen
Keyword(s):  
Solar Cell ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Polymer Solar Cell ◽  
Cell Structure ◽  
Short Circuit ◽  
Conductive Polymer ◽  
Weight Ratio ◽  
Short Circuit Current ◽  
Short Circuit Current Density

Poly (3-hexylthiophene) (P3HT) is a wide application in active layer of solar cell. It is a soluble conductive polymer but their mechanical properties are poor and its conductivity is unstable in environmental condition. We add polymethylmethacrylate (PMMA) into active layer to overcome these disadvantages. We investigated the effect of adding PMMA and graphene into solar cell on its characteristics of polymer solar cell. The cell structure was ITO/PEDOT:PSS/P3HT:PCBM:PMMA/Ca/Al. The 0.02, 0.04 and 0.06 weight ratio of PMMA were added into the P3HT:PCBM (1:1 ratio by weight) active layer. The device with 0.04 PMMA exhibits the highest short circuit current density (Jsc, 9.01 mA/cm2 ) and power conversion efficiency (PCE, 3.39%). The increases of Jsc and PCE are 26.5% and 49.3%, respectively compared with the device based on the pristine P3HT:PCBM active layer giving Jsc and PCE of 7.12 mA/cm2 and 2.27%. Graphene exhibits good electron conductivity, thermal conductivity, chemical stability and strength. We investigated the effect of inserting graphene between hole transfer layer (HTL) of poly (ethylene dioxythiophene) (PEDOT)-polystyrene sulfonic acid (PSS) (PEDOT:PSS) and active layer on the characteristics of polymer solar cell. The cell structure was ITO/PEDOT:PSS/Graphene/P3HT:PCBM:PMMA/Ca/Al. The concentration of graphene solution was 2.2 mg/ml and the graphene layer was coated by spin-coating at 6000 rpm and the weight ratio of PMMA in the P3HT:PCBM active layer was 0.04. The Jsc of device was increased to 9.45 mA/cm2 , an increase of 32.7%. The PCE of the device was increased to 3.63%, an increase of 59.9%.

Degradation of Polymer Solar Cells Based on P3HT:PCBM System

2014 ◽  
Vol 924 ◽  
pp. 193-199 ◽  
Author(s):  
Huang Zhong Yu
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Fill Factor ◽  
Polymer Solar Cells ◽  
Short Circuit ◽  
Acid Methyl Ester ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Solar Cell Performance ◽  
Deep Traps

The degradation of the performance of the polymer solar cell based on the blend structures system of poly (3-hexylthiophene) (P3HT) and [6,-phenyl C61-butyric acid methyl ester (PCBM) is investigated. This study uses UV-vis absorption spectra, photoluminescence (PL) spectra, charge-transport dark J-V curve chart to explicate the reason for the degradation of the performance of P3HT:PCBM photovoltaic cells. Solar cell performance is degraded primarily through loss in short-circuit current density (Jsc) and fill factor (FF), the reduction in the Jsc and FF of the device is most likely to be due to the formation of the charge transfer complex, deep traps and destruction of the-conjugated system in the degraded P3HT:PCBM device. The exposure to oxygen and photo-oxidation lead to the emergence of these factors of the device performance degradation. Keywords: Degradation; Performance; Solar cells; P3HT: PCBM

High short-circuit current density in a non-toxic Bi2S3 Quantum dot sensitized solar cell

2021 ◽  
pp. 100783
Author(s):  
Christopher Rosiles-Perez ◽  
Sirak Sidhik ◽  
Luis Ixtilico-Cortés ◽  
Fernando Robles-Montes ◽  
Tzarara López-Luke ◽  
...  
Keyword(s):  
Solar Cell ◽  
Quantum Dot ◽  
Current Density ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density

scholarly journals CdTe-Based Thin Film Solar Cells: Past, Present and Future

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1684
Author(s):  
Alessandro Romeo ◽  
Elisa Artegiani
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Early Years ◽  
Solar Cell Efficiency ◽  
Cell Efficiency

CdTe is a very robust and chemically stable material and for this reason its related solar cell thin film photovoltaic technology is now the only thin film technology in the first 10 top producers in the world. CdTe has an optimum band gap for the Schockley-Queisser limit and could deliver very high efficiencies as single junction device of more than 32%, with an open circuit voltage of 1 V and a short circuit current density exceeding 30 mA/cm2. CdTe solar cells were introduced at the beginning of the 70s and they have been studied and implemented particularly in the last 30 years. The strong improvement in efficiency in the last 5 years was obtained by a new redesign of the CdTe solar cell device reaching a single solar cell efficiency of 22.1% and a module efficiency of 19%. In this paper we describe the fabrication process following the history of the solar cell as it was developed in the early years up to the latest development and changes. Moreover the paper also presents future possible alternative absorbers and discusses the only apparently controversial environmental impacts of this fantastic technology.

scholarly journals Over 30% efficiency bifacial 4-terminal perovskite-heterojunction silicon tandem solar cells with spectral albedo

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sangho Kim ◽  
Thanh Thuy Trinh ◽  
Jinjoo Park ◽  
Duy Phong Pham ◽  
Sunhwa Lee ◽  
...  
Keyword(s):  
Solar Cell ◽  
Conversion Efficiency ◽  
Crystalline Silicon ◽  
Short Circuit ◽  
Solar Spectrum ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Production Costs ◽  
White Sand ◽  
Reflected Light

AbstractWe developed and designed a bifacial four-terminal perovskite (PVK)/crystalline silicon (c-Si) heterojunction (HJ) tandem solar cell configuration albedo reflection in which the c-Si HJ bottom sub-cell absorbs the solar spectrum from both the front and rear sides (reflected light from the background such as green grass, white sand, red brick, roofing shingle, snow, etc.). Using the albedo reflection and the subsequent short-circuit current density, the conversion efficiency of the PVK-filtered c-Si HJ bottom sub-cell was improved regardless of the PVK top sub-cell properties. This approach achieved a conversion efficiency exceeding 30%, which is higher than those of both the top and bottom sub-cells. Notably, this efficiency is also greater than the Schockley–Quiesser limit of the c-Si solar cell (approximately 29.43%). The proposed approach has the potential to lower industrial solar cell production costs in the near future.

Enhancement of the performance of CdS/CdTe heterojunction solar cell using TiO2/ZnO bi-layer ARC and V2O5 BSF layers: A simulation approach

2020 ◽  
Vol 92 (2) ◽  
pp. 20901
Author(s):  
Abdul Kuddus ◽  
Md. Ferdous Rahman ◽  
Jaker Hossain ◽  
Abu Bakar Md. Ismail
Keyword(s):  
Solar Cell ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Heterojunction Solar Cell ◽  
Back Surface ◽  
Heterojunction Solar Cells

This article presents the role of Bi-layer anti-reflection coating (ARC) of TiO2/ZnO and back surface field (BSF) of V2O5 for improving the photovoltaic performance of Cadmium Sulfide (CdS) and Cadmium Telluride (CdTe) based heterojunction solar cells (HJSCs). The simulation was performed at different concentrations, thickness, defect densities of each active materials and working temperatures to optimize the most excellent structure and working conditions for achieving the highest cell performance using obtained optical and electrical parameters value from the experimental investigation on spin-coated CdS, CdTe, ZnO, TiO2 and V2O5 thin films deposited on the glass substrate. The simulation results reveal that the designed CdS/CdTe based heterojunction cell offers the highest efficiency, η of ∼25% with an enhanced open-circuit voltage, Voc of 0.811 V, short circuit current density, Jsc of 38.51 mA cm−2, fill factor, FF of 80% with bi-layer ARC and BSF. Moreover, it appears that the TiO2/ZnO bi-layer ARC, as well as ETL and V2O5 as BSF, could be highly promising materials of choice for CdS/CdTe based heterojunction solar cell.

scholarly journals Simulation of a perovskite sandwich solar cell with the p-CZTS / p-CH3NH3PbCI3 / p-CZTS absorber layers

2021 ◽  
Vol 877 (1) ◽  
pp. 012001
Author(s):  
Marwah S Mahmood ◽  
N K Hassan
Keyword(s):  
Solar Cell ◽  
Conversion Efficiency ◽  
Current Density ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Current Voltage ◽  
Cell Capacitance

Abstract Perovskite solar cells attract the attention because of their unique properties in photovoltaic cells. Numerical simulation to the structure of Perovskite on p-CZTS/p-CH3NH3PbCI3/p-CZTS absorber layers is performed by using a program solar cell capacitance simulator (SCAPS-1D), with changing absorber layer thickness. The effect of thickness p-CZTS/p-CH3NH3PbCI3/p-CZTS, layers at (3.2μm, 1.8 μm, 1.1 μm) respectively are studied. The obtained results are short circuit current density (Jsc ), open circuit voltage (V oc), fill factor (F. F) and power conversion efficiency (PCE) equal to (28 mA/cm2, 0.83 v, 60.58 % and 14.25 %) respectively at 1.1 μm thickness. Our findings revealed that the dependence of current - voltage characteristics on the thickness of the absorbing layers, an increase in the amount of short circuit current density with an increase in the thickness of the absorption layers and thus led to an increase in the conversion efficiency and improvement of the cell by increasing the thickness of the absorption layers.

scholarly journals Optimized Thin-Film Organic Solar Cell with Enhanced Efficiency

2021 ◽  
Vol 13 (23) ◽  
pp. 13087
Author(s):  
Waqas Farooq ◽  
Muhammad Ali Musarat ◽  
Javed Iqbal ◽  
Syed Asfandyar Ali Kazmi ◽  
Adnan Daud Khan ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Organic Solar Cell ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Bragg Reflector ◽  
Performance Parameters ◽  
Distributed Bragg Reflector

Modification of a cell’s architecture can enhance the performance parameters. This paper reports on the numerical modeling of a thin-film organic solar cell (OSC) featuring distributed Bragg reflector (DBR) pairs. The utilization of DBR pairs via the proposed method was found to be beneficial in terms of increasing the performance parameters. The extracted results showed that using DBR pairs helps capture the reflected light back into the active region by improving the photovoltaic parameters as compared to the structure without DBR pairs. Moreover, implementing three DBR pairs resulted in the best enhancement gain of 1.076% in power conversion efficiency. The measured results under a global AM of 1.5G were as follows: open circuit voltage (Voc) = 0.839 V; short circuit current density (Jsc) = 10.98 mA/cm2; fill factor (FF) = 78.39%; efficiency (η) = 11.02%. In addition, a thermal stability analysis of the proposed design was performed and we observed that high temperature resulted in a decrease in η from 11.02 to 10.70%. Our demonstrated design may provide a pathway for the practical application of OSCs.

scholarly journals Silicon Substrate Treated with Diluted NaOH Aqueous for Si/PEDOT: PSS Heterojunction Solar Cell with Performance Enhancement

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4659
Author(s):  
Tao Chen ◽  
Hao Guo ◽  
Leiming Yu ◽  
Tao Sun ◽  
Yu Yang
Keyword(s):  
Aqueous Solution ◽  
Solar Cell ◽  
Silicon Substrate ◽  
High Performance ◽  
Immersion Time ◽  
Performance Enhancement ◽  
Light Trapping ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density

Si/PEDOT: PSS solar cell is an important alternative for photovoltaic device due to its anticipated high theoretical efficiency and simple manufacturing process. In this study, processing silicon substrate with diluted NaOH aqueous solution was found to be an effective method for improving device performance, one that notably improves junction quality and light trapping ability. When immersed in diluted NaOH aqueous solution, the junction quality was improved according to the enlarged fill factor, reduced series resistance, and enhanced minor carrier lifetime. The diluted NaOH aqueous solution immersion etched the silicon surface and helped with the enhancement of light trapping ability, further improving the short-circuit current density. Although diluted NaOH aqueous solution immersion for bare silicon could improve the performance of devices, proper immersion time was needed. The influence of immersion time on device performances was investigated. The photovoltaic conversion efficiency easily increased from 10.01% to 12.05% when silicon substrate was immersed in diluted NaOH aqueous for 15 min. This study contributes to providing efficient and convenient methods for preparing high performance Si/PEDOT: PSS solar cells.

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