How charges separate: correlating disorder, free energy, and open-circuit voltage in organic photovoltaics

2019 ◽  
Vol 216 ◽  
pp. 236-251 ◽  
Author(s):  
Débora P. Mroczek ◽  
Vladimir Lankevich ◽  
Eric R. Bittner
Keyword(s):  
Free Energy ◽  
Density Of States ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Organic Polymer ◽  
Type Ii ◽  
Model Type ◽  
Polymer Photovoltaics ◽  
Energetic Disorder

In this paper, we discuss our recent efforts to correlate the role of density of states, entropy, and configurational and energetic disorder to the open-circuit voltage, VOC, of model type-II organic polymer photovoltaics.

MoS2/Graphene Heterostructure Anode for Li-Ion Battery Application: A First-Principles Study

2021 ◽  
Vol 896 ◽  
pp. 53-59
Author(s):  
Yi Yang Shen
Keyword(s):  
Density Of States ◽  
First Principles ◽  
Open Circuit Voltage ◽  
Discharge Rate ◽  
Open Circuit ◽  
Crystal Formation ◽  
Li Ion Battery ◽  
Li Ion ◽  
Battery Anode ◽  
Charge Discharge

The development of next generation Li ion battery has attracted many attentions of researchers due to the rapidly increasing demands to portable energy storage devices. General Li metal/alloy anodes are confronted with challenges of dendritic crystal formation and slow charge/discharge rate. Recently, the prosperity of two-dimensional materials opens a new window for the design of battery anode. In the present study, MoS2/graphene heterostructure is investigate for the anode application of Li ion battery using first-principles calculations. The Li binding energy, open-circuit voltage, and electronic band structures are acquired for various Li concentrations. We found the open-circuit voltage decreases from ~2.28 to ~0.4 V for concentration from 0 to 1. Density of states show the electrical conductivity of the intercalated heterostructures can be significantly enhanced. The charge density differences are used to explain the variations of voltage and density of states. Last, ~0.43 eV diffusion energy barrier of Li implies the possible fast charge/discharge rate. Our study indicate MoS2/graphene heterostructure is promising material as Li ion battery anode.

Investigating the Role of Dye Dipole on Open Circuit Voltage in Solid-State Dye-Sensitized Solar Cells

2011 ◽  
Vol 50 (6) ◽  
pp. 06GF08 ◽  
Author(s):  
Shyam S. Pandey ◽  
Kyung-Young Lee ◽  
Azwar Hayat ◽  
Yuhei Ogomi ◽  
Shuzi Hayase
Keyword(s):  
Solar Cells ◽  
Solid State ◽  
Open Circuit Voltage ◽  
Dye Sensitized Solar Cells ◽  
Open Circuit ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Crucial Role of the Electron Transport Layer and UV Light on the Open-Circuit Voltage Loss in Inverted Organic Solar Cells

2017 ◽  
Vol 9 (39) ◽  
pp. 34131-34138 ◽  
Author(s):  
Aurélien Tournebize ◽  
Giorgio Mattana ◽  
Thérèse Gorisse ◽  
Antoine Bousquet ◽  
Guillaume Wantz ◽  
...  
Keyword(s):  
Electron Transport ◽  
Organic Solar Cells ◽  
Crucial Role ◽  
Open Circuit Voltage ◽  
Uv Light ◽  
Open Circuit ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Voltage Loss

TiO2 Nanotube Arrays by using ZnO Nanorod Template through Liquid Phase Deposition for Organic- Inorganic Hybrid Photovoltaic Cells

2008 ◽  
Vol 1113 ◽  
Author(s):  
Thitima Rattanavoravipa ◽  
Takashi Sagawa ◽  
Susumu Yoshikawa
Keyword(s):  
Liquid Phase ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Organic Polymer ◽  
Oxide Surface ◽  
Nanotube Arrays ◽  
Zno Nanorod ◽  
Liquid Phase Deposition ◽  
Blended Polymer

ABSTRACTTiO2 nanotube arrays had been selected as electron transport material incorporate with P3HT:PCBM blended polymer to fabricate the hybrid organic-inorganic solar cells. Well aligned TiO2 nanotube arrays has been synthesized though the liquid phase deposition by using ZnO nanorod arrays as templates. Three types of dyes (viz. NKX-2677, D149, N719) were adsorbed onto the surface of TiO2 nanotube arrays to increase the interfacial contacts between the organic polymer and inorganic metal oxide. Surface modification with NKX-2677 exhibited remarkable improvement of the cell efficiencies in terms of current density, open circuit voltage, and fill factor as compared with those of other dyes.

Inline PL Inspection and Advanced Offline Evaluation of Passivation Defects, Charge and Interfaces

2013 ◽  
Vol 205-206 ◽  
pp. 128-135 ◽  
Author(s):  
Andrew Findlay ◽  
Jacek Lagowski ◽  
Marshall Wilson ◽  
John D'Amico ◽  
Alexandre Savtchouk ◽  
...  
Keyword(s):  
Field Effect ◽  
Open Circuit Voltage ◽  
Surface Recombination ◽  
Open Circuit ◽  
Dielectric Films ◽  
Saturation Current ◽  
Cause Analysis ◽  
Root Cause ◽  
Dielectric Charge

Recently introduced techniques for whole wafer mapping and imaging create new possibilities for root cause analysis of emitter passivation defects. Inline compatible PL imaging identifies such defects as localized regions with increased emitter saturation current and reduced implied open circuit voltage. Advanced offline evaluation of defective areas can be then performed with multiparameter noncontact measurements capable to establish the role of surface recombination, the interface trap density, or the dielectric charge that controls the field-effect passivation. The relevant novel metrologies are discussed and are illustrated using examples of advanced silicon passivation by dielectric films and by a-Si heterojunction structures.

scholarly journals Comparison in optoelectronic properties of triphenylamine-imidazole or imidazole as donor for dye–sensitized solar cell: Theoretical approach

2021 ◽  
Author(s):  
Assia Bourouina ◽  
Mâammar Rekis
Keyword(s):  
Free Energy ◽  
Open Circuit Voltage ◽  
Dft Method ◽  
Open Circuit ◽  
Organic Dye ◽  
Dye Sensitized ◽  
Td Dft ◽  
Structural And Electronic Properties ◽  
Harvesting Efficiency ◽  
Dye Regeneration

Abstract In the present work, the structural and electronic properties of the D-D'-π-A organic dye with two donors have been calculated theoretically by DFT/TD-DFT method. In order to prove their efficiency as sensitizers, a comparative study was performed with a serie of D-π-A architecture with one donor. The results of light harvesting efficiency (LHE), open circuit voltage (Voc), free energy injection (∆Ginj), free energy dye regeneration (∆Greg,) excited-state lifetimes for the two series reveal that the D-D'-π-A dyes are promising for the design of new sensitive dyes in solar cells.

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