Ultrafast Channel I and Channel II Charge Generation Processes at a Nonfullerene Donor-Acceptor PTB7:PDI Interface is Crucial for Its Excellent Photovoltaic Performance

2021 ◽  
Author(s):  
Kai Li ◽  
Dong-Hui Xu ◽  
Xin Wang ◽  
Xiangyang Liu
Keyword(s):  
Solar Cells ◽  
Absorption Coefficient ◽  
Organic Solar Cells ◽  
Low Cost ◽  
Photovoltaic Performance ◽  
Charge Generation ◽  
Donor Acceptor ◽  
High Absorption Coefficient ◽  
High Absorption

Nonfullerene organic solar cells have received much attention in recent years due to their low cost, high absorption coefficient and excellent synthetic flexibility. However, the microscopic photoinduced dynamics at corresponding...

Efficient ternary organic solar cells with high absorption coefficient DIB-SQ as the third component

2018 ◽  
Vol 27 (5) ◽  
pp. 058802 ◽  
Author(s):  
Hui-Xin Qi ◽  
Bo-Han Yu ◽  
Sai Liu ◽  
Miao Zhang ◽  
Xiao-Ling Ma ◽  
...  
Keyword(s):  
Solar Cells ◽  
Absorption Coefficient ◽  
Organic Solar Cells ◽  
The Third ◽  
High Absorption Coefficient ◽  
High Absorption

High absorption coefficient π-conjugation-extended donor-acceptor copolymers for ternary-blend solar cells

2020 ◽  
Vol 83 ◽  
pp. 105738
Author(s):  
Hyeongjin Hwang ◽  
Chaneui Park ◽  
Dong Hun Sin ◽  
Eunjoo Song ◽  
Kilwon Cho
Keyword(s):  
Solar Cells ◽  
Absorption Coefficient ◽  
Ternary Blend ◽  
Donor Acceptor ◽  
High Absorption Coefficient ◽  
High Absorption

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

2021 ◽  
Author(s):  
Shahidul Alam ◽  
Vojtech Nádaždy ◽  
Tomáš Váry ◽  
Christian Friebe ◽  
Rico Meitzner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Solar Cells ◽  
Charge Transfer ◽  
Energy Level ◽  
Density Of States ◽  
Organic Solar Cells ◽  
Joint Density ◽  
Charge Generation ◽  
Donor Acceptor

Energy level alignments at the organic donor–acceptor interface cannot be predicted from cyclic voltammetry. Onsets for joint density of states and charge generation, reveal cases of energy uphill and – newly observed – downhill charge generation.

9.6%- Efficient All-Inorganic Sb2(S,Se)3 Solar Cell with MnS Hole-Transporting Laye

2022 ◽  
Author(s):  
Chen Qian ◽  
Jianjun Li ◽  
Kaiwen Sun ◽  
Chenhui Jiang ◽  
Jialiang Huang ◽  
...  
Keyword(s):  
Solar Cell ◽  
Absorption Coefficient ◽  
Light Harvesting ◽  
Low Cost ◽  
The Poor ◽  
Hole Transporting ◽  
Low Toxic ◽  
High Absorption Coefficient ◽  
Poor Stability ◽  
High Absorption

Antimony selenosulfide, Sb2(S,Se)3, has emerged as a promising light-harvesting material for its high absorption coefficient, suitable bandgap, low-toxic and low-cost constituents. However, the poor stability and high cost of widely...

Organic and nano-structured composite photovoltaics: An overview

2005 ◽  
Vol 20 (12) ◽  
pp. 3167-3179 ◽  
Author(s):  
Sophie E. Gledhill ◽  
Brian Scott ◽  
Brian A. Gregg
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Organic Materials ◽  
Low Cost ◽  
Open Circuit ◽  
Charge Generation ◽  
Dye Sensitized ◽  
Excitonic Solar Cells

Organic photovoltaic devices are poised to fill the low-cost, low power niche in the solar cell market. Recently measured efficiencies of solid-state organic cells are nudging 5% while Grätzel’s more established dye-sensitized solar cell technology is more than double this. A fundamental understanding of the excitonic nature of organic materials is an essential backbone for device engineering. Bound electron-hole pairs, “excitons,” are formed in organic semiconductors on photo-absorption. In the organic solar cell, the exciton must diffuse to the donor–accepter interface for simultaneous charge generation and separation. This interface is critical as the concentration of charge carriers is high and recombination here is higher than in the bulk. Nanostructured engineering of the interface has been utilized to maximize organic materials properties, namely to compensate the poor exciton diffusion lengths and lower mobilities. Excitonic solar cells have different limitations on their open-circuit photo-voltages due to these high interfacial charge carrier concentrations, and their behavior cannot be interpreted as if they were conventional solar cells. This article briefly reviews some of the differences between excitonic organic solar cells and conventional inorganic solar cells and highlights some of the technical strategies used in this rapidly progressing field, whose ultimate aim is for organic solar cells to be a commercial reality.

An investigation of physical properties and photovoltaic performance of methylammonium lead-tin iodide (CH3NH3Sn1-xPbxI3) solar cells

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Omid Malekan ◽  
Mehdi Adelifard ◽  
Mohamad Mehdi Bagheri Mohagheghi
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Conversion Efficiency ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
X Ray Diffraction ◽  
Content Type ◽  
X Ray ◽  
High Absorption Coefficient ◽  
High Absorption

Purpose In the past several years, CH3NH3PbI3 perovskite material has been extensively evaluated as an absorber layer of perovskite solar cells due to its excellent structural and optical properties, and greater than 22% conversion efficiency. However, improvement and future commercialization of solar cells based on CH3NH3PbI3 encountered restrictions due to toxicity and instability of the lead element. Recently, studies on properties of lead-free and mixture of lead with other cations perovskite thin films as light absorber materials have been reported. The purpose of this paper was the fabrication of CH3NH3Sn1-xPbxI3 thin films with different SnI2 concentrations in ambient condition, and study on the structural, morphological, optical, and photovoltaic performance of the studied solar cells. The X-ray diffraction studies revealed the formation of both CH3NH3PbI3 and CH3NH3SnI3 phases with increasing the Sn concentration, and improvement in crystallinity and morphology was also observed. All perovskite layers had a relatively high absorption coefficient >104 cm−1 in the visible wavelengths, and the bandgap values varied in the range from 1.46 to 1.63 eV. Perovskite solar cells based on these thin films have been fabricated, and device performance was investigated. Results showed that photo-conversion efficiency (PCE) for the pure CH3NH3PbI3sample was 1.20%. With adding SnI2, PCE was increased to 4.48%. Design/methodology/approach In this work, the author mixed tin and lead with different percentages in the perovskite thin film. Also, the preparation of these layers and also other layers to fabricate solar cells based on them were conducted in an open and non-glove box environment. Finally, the effect of [Sn/Pb] ratio in the CH3NH3Sn1-xPbxI3 layers on the structural, morphological, optical, electrical and photovoltaic performance have been investigated. Findings CH3NH3Sn1-xPbxI3 (x = 0.0, 0.25, 0.50, 0.75, 1.0) perovskite thin films have been grown by a spin-coating technique. It was found that as tin concentration increases, the X-ray diffraction and FESEM images studies revealed the formation of both CH3NH3PbI3 and CH3NH3SnI3 phases, and improvement in crystallinity, and morphology; all thin films had high absorption coefficient values close to 104 cm−1 in the visible region, and the direct optical bandgap in the layers decreases from 1.63 eV in pure CH3NH3SnI3 to 1.46 eV for CH3NH3Sn0.0.25Pb0.75I3 samples; all thin films had p-type conductivity, and mobility and carrier density increased; perovskite solar cells based on these thin films have been fabricated, and device performance was investigated. Results showed that photo-conversion efficiency (PCE) for the pure CH3NH3PbI3sample was 1.20%. With adding SnI2, PCE was increased to 4.48%. Originality/value The preparation method seems to be interesting as it is in an ambient environment without the protection of nitrogen or argon gas.

scholarly journals Long-lived and disorder-free charge transfer states enable endothermic charge separation in efficient non-fullerene organic solar cells

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ture F. Hinrichsen ◽  
Christopher C. S. Chan ◽  
Chao Ma ◽  
David Paleček ◽  
Alexander Gillett ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Free Charge ◽  
Charge Generation ◽  
Time Resolved ◽  
Thermodynamic Conditions ◽  
Donor Acceptor ◽  
Interfacial Charge

Abstract Organic solar cells based on non-fullerene acceptors can show high charge generation yields despite near-zero donor–acceptor energy offsets to drive charge separation and overcome the mutual Coulomb attraction between electron and hole. Here, we use time-resolved optical spectroscopy to show that free charges in these systems are generated by thermally activated dissociation of interfacial charge-transfer states that occurs over hundreds of picoseconds at room temperature, three orders of magnitude slower than comparable fullerene-based systems. Upon free electron–hole encounters at later times, both charge-transfer states and emissive excitons are regenerated, thus setting up an equilibrium between excitons, charge-transfer states and free charges. Our results suggest that the formation of long-lived and disorder-free charge-transfer states in these systems enables them to operate closely to quasi-thermodynamic conditions with no requirement for energy offsets to drive interfacial charge separation and achieve suppressed non-radiative recombination.

scholarly journals All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Ruimin Zhou ◽  
Zhaoyan Jiang ◽  
Chen Yang ◽  
Jianwei Yu ◽  
Jirui Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Photovoltaic System ◽  
Active Layers ◽  
Donor Acceptor

AbstractThe high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930 nm along with our home-designed small molecule is selected as electron acceptors. To the best of our knowledge, the binary all-small-molecule OSCs achieve the highest efficiency of 14.34% by optimizing their hierarchical morphologies, in which the donor or acceptor rich domains with size up to ca. 70 nm, and the donor crystals of tens of nanometers, together with the donor-acceptor blending, are proved coexisting in the hierarchical large domain. All-small-molecule photovoltaic system shows its promising for high performance OSCs, and our study is likely to lead to insights in relations between bulk heterojunction structure and photovoltaic performance.

scholarly journals A simulation of Gallium Indium Nitride Based Solar Cells

2020 ◽  
Author(s):  
Jin Wu
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Absorption Coefficient ◽  
Indium Nitride ◽  
Solar Spectrum ◽  
Thin Layers ◽  
Gallium Indium Nitride ◽  
Optimal Values ◽  
High Absorption Coefficient ◽  
High Absorption

InGaN can reach all values of bandgap from 3.42 to 0.7eV, which covers almost the entire solar spectrum. This study is to understand the influence of each parameter of the solar cell for an improved optimization of performance. The yield obtained for a reference cell is 12.2 % for optimal values of doping of the layers. For generation and recombination, performance of the cell varies with these settings. III nitrides have a high absorption coefficient, a very thin layers of material are sufficient to absorb most of the light.

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