Enhanced conduction and charge-selectivity by N-doped graphene flakes in the active layer of bulk-heterojunction organic solar cells

2013 ◽  
Vol 6 (10) ◽  
pp. 3000 ◽  
Author(s):  
Gwang Hoon Jun ◽  
Sung Hwan Jin ◽  
Bin Lee ◽  
Bo Hyun Kim ◽  
Weon-Sik Chae ◽  
...  
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Charge Selectivity ◽  
Graphene Flakes ◽  
Doped Graphene

Internal nanoscale architecture and charge carrier dynamics of wide bandgap non-fullerene bulk heterojunction active layers in organic solar cells

2020 ◽  
Vol 8 (44) ◽  
pp. 23628-23636
Author(s):  
Xinyu Jiang ◽  
Hongwon Kim ◽  
Peter S. Deimel ◽  
Wei Chen ◽  
Wei Cao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Wide Bandgap ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Active Layers ◽  
Solvent Additive

The nanoscale architecture of active layer based on wide bandgap non-fullerene solar cells exhibits pronounced influence by the solvent additive.

scholarly journals Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kui Jiang ◽  
Jie Zhang ◽  
Zhengxing Peng ◽  
Francis Lin ◽  
Shengfan Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Performance ◽  
Diffusion Length ◽  
Bulk Heterojunction ◽  
Short Circuit ◽  
Full Potential ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

AbstractSolution-processed organic solar cells (OSCs) are a promising candidate for next-generation photovoltaic technologies. However, the short exciton diffusion length of the bulk heterojunction active layer in OSCs strongly hampers the full potential to be realized in these bulk heterojunction OSCs. Herein, we report high-performance OSCs with a pseudo-bilayer architecture, which possesses longer exciton diffusion length benefited from higher film crystallinity. This feature ensures the synergistic advantages of efficient exciton dissociation and charge transport in OSCs with pseudo-bilayer architecture, enabling a higher power conversion efficiency (17.42%) to be achieved compared to those with bulk heterojunction architecture (16.44%) due to higher short-circuit current density and fill factor. A certified efficiency of 16.31% is also achieved for the ternary OSC with a pseudo-bilayer active layer. Our results demonstrate the excellent potential for pseudo-bilayer architecture to be used for future OSC applications.

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...

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.

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.

Simultaneous enhancement of charge generation quantum yield and carrier transport in organic solar cells

2015 ◽  
Vol 3 (41) ◽  
pp. 10799-10812 ◽  
Author(s):  
Ardalan Armin ◽  
Pascal Wolfer ◽  
Paul E. Shaw ◽  
Mike Hambsch ◽  
Fatemeh Maasoumi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Yield ◽  
Charge Carrier ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Bulk Heterojunction ◽  
Charge Generation ◽  
Layer Structures

Bulk heterojunction (BHJ) organic solar cells and photodiodes require optimised active layer structures for both charge carrier photo-generation and extraction to occur efficiently.

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