Polymer Triplet Energy Levels Need Not Limit Photocurrent Collection in Organic Solar Cells

2012 ◽  
Vol 134 (48) ◽  
pp. 19661-19668 ◽  
Author(s):  
Cody W. Schlenker ◽  
Kung-Shih Chen ◽  
Hin-Lap Yip ◽  
Chang-Zhi Li ◽  
Liam R. Bradshaw ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Energy Levels ◽  
Triplet Energy

scholarly journals Emphasizing the Operational Role of a Novel Graphene-Based Ink into High Performance Ternary Organic Solar Cells

2019 ◽  
Author(s):  
Minas M. Stylianakis ◽  
Dimitriοs M. Kosmidis ◽  
Katerina Anagnostou ◽  
Christos Polyzoidis ◽  
Miron Krassas ◽  
...  
Keyword(s):  
Solar Cells ◽  
Molecular Orbital ◽  
Organic Solar Cells ◽  
High Performance ◽  
Energy Levels ◽  
Fullerene Derivative ◽  
Highest Occupied Molecular Orbital ◽  
Lowest Unoccupied Molecular Orbital ◽  
Synthetic Routes

A novel solution-processed graphene-based material was synthesized by treating graphene oxide (GO) with 2,5,7-trinitro-9-oxo-fluorenone-4-carboxylic acid (TNF-COOH) moieties, via simple synthetic routes. The yielded molecule N-[(carbamoyl-GO)ethyl]-N’-[(carbamoyl)-(2,5,7-trinitro-9-oxo-fluorene)] (GO-TNF) was thoroughly characterized and it was shown that it presents favorable highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels to function as a bridge component between the polymeric donor poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl}) (PTB7) and the fullerene derivative acceptor [6,6]-phenyl-C71-butyric-acid-methylester (PC71BM). In this context, a GO-TNF based ink was prepared and directly incorporated within the binary photoactive layer, in different volume ratios (1-3% ratio to the blend), for the effective realization of inverted ternary organic solar cells (OSCs) of the structure ITO/PFN/PTB7:GO-TNF:PC71BM/MoO3/Al. The addition of 2% v/v GO-TNF ink led to a champion power conversion efficiency (PCE) of 8.71% that was enhanced by ~13% as compared to the reference cell.

Benzotriazacycle Cored Perylene Diimide Non-fullerene Acceptors for High-performance Organic Solar Cells

2021 ◽  
Vol 01 ◽  
Author(s):  
Min Deng ◽  
Zhenkai Ji ◽  
Xiaopeng Xu ◽  
Liyang Yu ◽  
Qiang Peng
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Energy Levels ◽  
Three Dimensional ◽  
Molecular Structures ◽  
Perylene Diimide ◽  
Photon Absorption ◽  
Optoelectronic Property ◽  
Design Synthesis

Background: Perylene diimide (PDI) is among the most investigated non-fullerene electron acceptor for organic solar cells (OSCs). Constructing PDI derivatives into three-dimensional propeller-like molecular structures is not only one of the viable routes to suppress the over aggregation tendency of the PDI chromophores, but also raises possibilities to tune and optimize the optoelectronic property of the molecules. Objective: In this work, we reported the design, synthesis, and characterization of three electron-accepting materials, namely BOZ-PDI, BTZ-PDI, and BIZ-PDI, each with three PDI arms linked to benzotrioxazole, benzotrithiazole, and benzotriimidazole based center cores, respectively. Method: The introduction of electron-withdrawing center cores with heteroatoms does not significantly complicate the synthesis of the acceptor molecules but drastically influences the energy levels of the propeller-like PDI derivatives. Result: The highest power conversion efficiency was obtained with benzoxazole-based BOZ-PDI reaching 7.70% for its higher photon absorption and charge transport ability. Conclusion: This work explores the utilization of electron-withdrawing cores with heteroatoms in the propeller-like PDI derivatives, which provides a handy tool to construct high-performance non-fullerene acceptor materials.

scholarly journals Stable P3HT: amorphous non-fullerene solar cells with a high open-circuit voltage of 1 V and efficiency of 4%

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20733-20741 ◽  
Author(s):  
HyunKyung Lee ◽  
Sora Oh ◽  
Chang Eun Song ◽  
Hang Ken Lee ◽  
Sang Kyu Lee ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Open Circuit Voltage ◽  
Energy Levels ◽  
Open Circuit ◽  
Good Thermal Stability

A 3D-shaped SF-HR was designed and synthesized for use in non-fullerene organic solar cells. Owing to the aligned energy levels, the P3HT:SF-HR system exhibited a high efficiency of 4.01% with good thermal stability and photostability.

DFT Study of New Donor-π-Acceptor Materials Based on Thieno[2,3-b] Indole Candidate for Organic Solar Cells Application

2020 ◽  
Vol 1002 ◽  
pp. 221-229
Author(s):  
Faeq A. Al-Temimei ◽  
Lubna A. Alasadi ◽  
Azhar S. Alaboodi
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Electronic Structures ◽  
Oxidation Process ◽  
Energy Gap ◽  
Energy Levels ◽  
Photovoltaic Properties ◽  
Photo Oxidation ◽  
Td Dft ◽  
Homo And Lumo

In present search, we report theoretical analysis by using DFT (TD-DFT)-B3LYP with 6-31G (d, p) level on the geometries, optoelectronic and absorption characteristics of novel a series of the donor-π-acceptor dyes. Their π-conjugated bridge is based on the thiophene, benzene, pyridine, and pyrazine, the thieno [2,3-b] indole was used as an electron donor (D) and the acid 2-cyanoacrylic was used as an electron acceptor (A) group. The theoretical information of the electronic structures such as energy levels (HOMO and LUMO) and energy gap of the molecules is based on study the dyes in organic solar cells. Consequently the energy levels, energy gap, photovoltaic properties, quantum chemical and absorption parameters of all the dyes have been computed and reported. The calculations show that the dyes under study can theoretically be good photosensitizers in DSSCs. Also, the results show that the LUMO levels of all dyes design lie over the conduction band (Ecb) of the semiconductors TiO2 (or PC70BM) likewise the HOMO levels lie under the decrease potential vitality of the (electrolytes) comparing to ability of electron transfer from the molecular dye excited state to TiO2 (or PC70BM) and chargeerenewal after photo-oxidation process, separately.

scholarly journals D-A-D structured organic molecules with diketopyrrolopyrrole acceptor unit for solution-processed organic solar cells

2014 ◽  
Vol 372 (2013) ◽  
pp. 20130009 ◽  
Author(s):  
Jing Zhang ◽  
Chang He ◽  
Zhi-Guo Zhang ◽  
Dan Deng ◽  
Maojie Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Organic Molecules ◽  
Bulk Heterojunction ◽  
Energy Levels ◽  
Orbital Energy ◽  
Broad Absorption ◽  
Photovoltaic Properties ◽  
Solution Processed ◽  
Highest Occupied Molecular Orbital

Four solution-processable D-A-D structured organic molecules with diketopyrrolopyrrole (DPP) as acceptor unit and triphenylamine (TPA) or (4-hexyl)thieno [3,2-b]thiophene (HTT) as donor unit, DPP8-TPA, DPP8-TPA-OR, DPP6-HTT and DPP8-HTT, were designed and synthesized for the application as donor materials in solution-processed organic solar cells (OSCs). The molecules show broad absorption and relatively lower highest occupied molecular orbital energy levels. Photovoltaic properties of the molecules were investigated by fabricating the bulk-heterojunction OSCs with the molecules as donor and PC 71 BM as acceptor. Power conversion efficiency of the OSC based on DPP8-HTT reached 1.5% under the illumination of AM1.5, 100 mW cm −2 .

scholarly journals Covalently Linked Donor-Acceptor Dyad for Efficient Single Material Organic Solar Cells

2019 ◽  
Author(s):  
Sebastian Lucas ◽  
Tim Leydecker ◽  
P. Samorì ◽  
Elena Mena Osteritz ◽  
Peter Baeuerle
Keyword(s):  
Solar Cells ◽  
Charge Transport ◽  
Organic Solar Cells ◽  
Energy Levels ◽  
Power Conversion ◽  
Frontier Orbitals ◽  
Donor Acceptor ◽  
Covalently Linked ◽  
Simplified Solution ◽  
Single Material

A novel covalently linked donor-acceptor dyad comprising a dithienopyrrol-based oligomeric donor and a fullerene acceptor was synthesized and characterized. The concomitant effect of favorable optoelectronic properties, energy levels of the frontier orbitals, and ambipolar charge transport enabled the application of the dyad in simplified solution-processed single material organic solar cells reaching a power conversion efficiency of 3.4%.<br><br><br>

Non-fullerene small molecule acceptors with three-dimensional thiophene/selenophene-annulated perylene diimides for efficient organic solar cells

2020 ◽  
Vol 8 (20) ◽  
pp. 6749-6755 ◽  
Author(s):  
Jiawei Pan ◽  
Ling Wang ◽  
Wei Chen ◽  
Shenglong Sang ◽  
Hua Sun ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Carrier Mobility ◽  
Energy Levels ◽  
Three Dimensional ◽  
Molecular Configuration ◽  
Perylene Diimides ◽  
High Carrier Mobility ◽  
High Carrier

Three-dimensional non-fullerene acceptors with a spiro core linked with S/Se fused perylene diimides possess appropriate energy levels, twisted molecular configuration and high carrier mobility, leading to a PCE of 6.95% for organic solar cells.

On the understanding of energy loss and device fill factor trade-offs in non-fullerene organic solar cells with varied energy levels

Nano Energy ◽  
2020 ◽  
Vol 75 ◽  
pp. 105032 ◽  
Author(s):  
Xuning Zhang ◽  
Nannan Yao ◽  
Rui Wang ◽  
Yanxun Li ◽  
Dongyang Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Energy Levels ◽  
Trade Offs
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