scholarly journals Effects of solvent additive on “s-shaped” curves in solution-processed small molecule solar cells

2016 ◽  
Vol 12 ◽  
pp. 2543-2555 ◽  
Author(s):  
John A Love ◽  
Shu-Hua Chou ◽  
Ye Huang ◽  
Guilllermo C Bazan ◽  
Thuc-Quyen Nguyen
Keyword(s):  
Solar Cells ◽  
Bulk Heterojunction ◽  
Energy Levels ◽  
Curve Shape ◽  
Broad Absorption ◽  
Current Voltage ◽  
Solvent Additive ◽  
The Common ◽  
Role Of Solvent

A novel molecular chromophore, p-SIDT(FBTThCA8)2, is introduced as an electron-donor material for bulk heterojunction (BHJ) solar cells with broad absorption and near ideal energy levels for the use in combination with common acceptor materials. It is found that films cast from chlorobenzene yield devices with strongly s-shaped current–voltage curves, drastically limiting performance. We find that addition of the common solvent additive diiodooctane, in addition to facilitating crystallization, leads to improved vertical phase separation. This yields much better performing devices, with improved curve shape, demonstrating the importance of morphology control in BHJ devices and improving the understanding of the role of solvent additives.

Revealing the role of solvent additives on morphology and energy loss in benzodifuran polymer based non-fullerene organic solar cells

2021 ◽  
Author(s):  
Zhi Zheng ◽  
Enfang He ◽  
Jie Wang ◽  
Zhaotong Qin ◽  
Tianqi Niu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Organic Solar Cells ◽  
Opposite Effect ◽  
Effective Strategy ◽  
Highly Efficient ◽  
Solvent Additive ◽  
Role Of Solvent

Solvent additive (SA) treatment is the most effective strategy to obtain highly efficient non-fullerene organic solar cells (NF-OSCs). However, NF-OSCs with SA treatment usually exhibits different or even opposite effect...

The Role of Solvent Additive Processing in High Performance Small Molecule Solar Cells

2014 ◽  
Vol 26 (22) ◽  
pp. 6531-6541 ◽  
Author(s):  
Louis A. Perez ◽  
James T. Rogers ◽  
Michael A. Brady ◽  
Yanming Sun ◽  
Gregory C. Welch ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
High Performance ◽  
Solvent Additive ◽  
Role Of Solvent

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 .

On the Role of Graphene in Polymer-Based Bulk Heterojunction Solar Cells

2012 ◽  
Vol 521 ◽  
pp. 47-60 ◽  
Author(s):  
Fei Yu ◽  
M. Bahner ◽  
Vikram K. Kuppa
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Graphene Nanosheets ◽  
Photoluminescence Quenching ◽  
Heterojunction Solar Cells ◽  
Current Voltage ◽  
Photovoltaic Applications ◽  
New Material

As a new material, graphene is considered to have great potential in photovoltaic applications, due to its superior physical and electronic properties. In this manuscript, the behavior of graphene nanosheets prepared by different processing methods were investigated in order to probe their applicability in polymer-based bulk heterojunction optoelectronic devices. Raman spectroscopy was employed to study the formation of interfaces between the conjugated polymer and graphene, while photoluminescence quenching was used to investigate charge transfer from P3HT to graphene. The current-voltage characteristics of fabricated cells were investigated to elucidate the role of graphene in their performance. We demonstrate that the addition of small quantities of graphene promotes exciton dissociation and charge transport in P3HT:PCBM BHJ devices, leading to a novel paradigm for organic solar cells.

Solar Cell Manufacturing Method with the Structure of the Bulk Heterojunction Based on Organic Semiconductors with a Direct Architecture

2016 ◽  
Vol 845 ◽  
pp. 224-227 ◽  
Author(s):  
Danila Saranin ◽  
Marina Orlova ◽  
Sergey Didenko ◽  
Oleg Rabinovich ◽  
Andrey Kryukov
Keyword(s):  
Solar Cells ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Research Output ◽  
Bulk Heterojunction ◽  
Organic Basis ◽  
Manufacturing Method ◽  
Current Voltage ◽  
Current Voltage Characteristics

This article presents the results of research output voltage characteristics of solar cells on an organic basis with the use of P3HT: PCBM system. There were produced organic solar cells in a coating in air, current-voltage characteristics were measured. It was determined the characteristic influence of a substrate cleaning and annealing temperature of layers applied on fill factor and conversion efficiency.

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.

Role of geminate polaron-pair recombination on magnetoconductance in P3HT and PC71BM bulk-heterojunction organic solar cells

2018 ◽  
Vol 63 ◽  
pp. 384-391 ◽  
Author(s):  
Se Jin Lee ◽  
Sang Bong Lee ◽  
Sung Cheol Yoon ◽  
Eun Young Choi ◽  
Choon Sup Yoon
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction
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