scholarly journals Effects of Nanoimprinted Structures on the Performance of Organic Solar Cells

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Hardeep Singh Gill ◽  
Lian Li ◽  
Haizhou Ren ◽  
Ravi Mosurkal ◽  
Jayant Kumar
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Incident Light ◽  
Power Conversion ◽  
Heterojunction Solar Cells ◽  
Higher Power ◽  
Carrier Collection ◽  
Conversion Efficiencies

The effect of nanoimprinted structures on the performance of organic bulk heterojunction solar cells was investigated. The nanostructures were formed over the active layer employing the soft lithographic technique. The measured incident photon-to-current efficiency revealed that the nanostructured morphology over the active layer can efficiently enhance both light harvesting and charge carrier collection due to improvement of the absorption of incident light and the buried nanostructured cathode, respectively. The devices prepared with the imprinted nanostructures exhibited significantly higher power conversion efficiencies as compared to those of the control cells.

Preparation of efficient oligomer-based bulk-heterojunction solar cells from eco-friendly solvents

2017 ◽  
Vol 5 (38) ◽  
pp. 9920-9928 ◽  
Author(s):  
Duško Popović ◽  
Ibrahim Ata ◽  
Johannes Krantz ◽  
Sebastian Lucas ◽  
Mika Lindén ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Halogenated Solvents ◽  
Conversion Efficiencies

A series of A–D–A type co-oligomers used as donors in organic solar cells are presented. Devices prepared exclusively from non-halogenated solvents via doctor-blading gave power conversion efficiencies of up to 7%.

Development of strongly absorbing S,N-heterohexacene-based donor materials for efficient vacuum-processed organic solar cells

2016 ◽  
Vol 4 (17) ◽  
pp. 3715-3725 ◽  
Author(s):  
Christoph Wetzel ◽  
Amaresh Mishra ◽  
Elena Mena-Osteritz ◽  
Karsten Walzer ◽  
Martin Pfeiffer ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
New Class ◽  
Conversion Efficiencies

A new class of A–D–A molecular donor materials based on planar S,N-heterohexacenes is developed for vacuum-processed planar and bulk-heterojunction solar cells providing promising power conversion efficiencies up to 7.1%.

Incorporating Semiflexible Linkers into Double-Cable Conjugated Polymers via Click Reaction

2021 ◽  
Author(s):  
Zhaofan Yang ◽  
Shijie Liang ◽  
Baiqiao Liu ◽  
Jing Wang ◽  
Fan Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Organic Solar Cells ◽  
Click Reaction ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Single Component ◽  
Photovoltaic Technology ◽  
Conversion Efficiencies ◽  
Excellent Stability

Single-component organic solar cells (SCOSCs) have been recognized as the promising photovoltaic technology due to the excellent stability, but their power conversion efficiencies (PCEs) are far lagging their bulk-heterojunction counterparts....

scholarly journals Synthesis, optoelectronic properties and photovoltaic performances of wide band-gap copolymers based on dibenzosilole and quinoxaline units, rivals to P3HT

2016 ◽  
Vol 7 (25) ◽  
pp. 4160-4175 ◽  
Author(s):  
F. Caffy ◽  
N. Delbosc ◽  
P. Chávez ◽  
P. Lévêque ◽  
J. Faure-Vincent ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Wide Band ◽  
Optoelectronic Properties ◽  
Wide Band Gap ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Conversion Efficiencies

Dibenzosilole and quinoxaline based copolymers were synthesized and tested in bulk-heterojunction solar cells showing power conversion efficiencies up to 5.14%.

scholarly journals Optimization of solution-processed oligothiophene:fullerene based organic solar cells by using solvent additives

2013 ◽  
Vol 4 ◽  
pp. 680-689 ◽  
Author(s):  
Gisela L Schulz ◽  
Marta Urdanpilleta ◽  
Roland Fitzner ◽  
Eduard Brier ◽  
Elena Mena-Osteritz ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Solution Processed ◽  
Heterojunction Solar Cells ◽  
Force Microscopy ◽  
Vacuum Technology ◽  
Atomic Force ◽  
Donor And Acceptor ◽  
Conversion Efficiencies

The optimization of solution-processed organic bulk-heterojunction solar cells with the acceptor-substituted quinquethiophene DCV5T-Bu 4 as donor in conjunction with PC61BM as acceptor is described. Power conversion efficiencies up to 3.0% and external quantum efficiencies up to 40% were obtained through the use of 1-chloronaphthalene as solvent additive in the fabrication of the photovoltaic devices. Furthermore, atomic force microscopy investigations of the photoactive layer gave insight into the distribution of donor and acceptor within the blend. The unique combination of solubility and thermal stability of DCV5T-Bu 4 also allows for fabrication of organic solar cells by vacuum deposition. Thus, we were able to perform a rare comparison of the device characteristics of the solution-processed DCV5T-Bu 4 :PC61BM solar cell with its vacuum-processed DCV5T-Bu 4 :C60 counterpart. Interestingly in this case, the efficiencies of the small-molecule organic solar cells prepared by using solution techniques are approaching those fabricated by using vacuum technology. This result is significant as vacuum-processed devices typically display much better performances in photovoltaic cells.

scholarly journals Self-assembled conjugated polyelectrolyte–surfactant complexes as efficient cathode interlayer materials for bulk heterojunction organic solar cells

2015 ◽  
Vol 3 (47) ◽  
pp. 23905-23916 ◽  
Author(s):  
Michèle Chevrier ◽  
Judith E. Houston ◽  
Jurgen Kesters ◽  
Niko Van den Brande ◽  
Ann E. Terry ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Conjugated Polyelectrolyte ◽  
Self Assembled ◽  
Interface Layers ◽  
Conversion Efficiencies ◽  
Cathode Interlayer

Conjugated polyelectrolyte–surfactant cathodic interface layers lead to improved power conversion efficiencies in organic solar cells.

Heterojunction solar cells with improved power conversion efficiency using graphene quantum dots

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 110493-110498 ◽  
Author(s):  
Yang Dang ◽  
Xinyang Zhang ◽  
Xin Chen ◽  
Bonan Kang ◽  
S. Ravi P. Silva
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Hydrothermal Method ◽  
Active Layer ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Graphene Quantum Dots ◽  
Heterojunction Solar Cells

The effect of incorporating graphene quantum dots (GQDs) synthesized by a hydrothermal method in the active layer of organic solar cells was investigated.

scholarly journals Crystallization driven boost in fill factor and stability in additive-free organic solar cells

2021 ◽  
Author(s):  
David Garcia Romero ◽  
Lorenzo Di Mario ◽  
Giuseppe Portale ◽  
Maria Antonietta Loi
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Bulk Heterojunction ◽  
Device Performance ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

The control of morphology and microstructure during and after the active layer processing of bulk-heterojunction solar cells is critical to obtain elevated fill factors and overall good device performance. With...

Effect of Cathode Metal Evaporation Rate on the Deep Trapped Hole Formation in Bulk Heterojunction Organic Solar Cells

2012 ◽  
Vol 1390 ◽  
Author(s):  
Emre Yengel ◽  
M. Saif Islam
Keyword(s):  
Solar Cells ◽  
Molecular Orbital ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Evaporation Rate ◽  
Bulk Heterojunction ◽  
Open Circuit ◽  
Donor Acceptor ◽  
Conversion Efficiencies ◽  
Cathode Metal

ABSTRACTIn bulk heterojunction organic solar cells, open-circuit voltage (Voc) is mainly dependent on the lowest unoccupied molecular orbital and the highest occupied molecular orbital of the donor/acceptor polymer pair in the active layer. However, there are other factors that contribute to considerable reduction in the Voc. The active layer/cathode interface is one of these factors. Previous studies show that e-beam evaporation of the cathode metal contact forms deep interface trap holes in the active layer which increases the Voc of the solar cells. Although these studies show the effect of deeply trapped holes on the Voc, several attempts to elucidate the mechanism behind this effect revealed their subtle and elusive nature. In this work, the effect of cathode contact annealing rate on the overall efficiency is studied. Three different sets of devices were fabricated with varying cathode evaporation rates of 0.1Å/s, 1Å/s and 5Å/s. The results show that at low evaporation rates, atoms in the cathode materials lack adequate energy to form deeply trapped holes. Additionally, above a certain value, the evaporation rate does not have a significant effect on the formation of deeply trapped holes. We also demonstrate that power conversion efficiencies of the devices can be maximized by maintaining the evaporation rate within a specific range.

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