Tuning the morphology of the active layer of organic solar cells by spin 1/2 radicals

2019 ◽  
Vol 43 (35) ◽  
pp. 13998-14008
Author(s):  
Yuancheng Qin ◽  
Manman Li ◽  
Yu Xie ◽  
Xue Li ◽  
Chunming Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Network Structure ◽  
Organic Solar Cells ◽  
Interpenetrating Network ◽  
Donor Acceptor

The morphology of the active layer, the formation of an interpenetrating network structure and the phase separation of donor–acceptor polymers has been improved by spin 1/2 radicals, and enhanced the PCEs of the organic solar cells.

scholarly journals Restricting the liquid–liquid phase separation of PTB7-Th:PF12TBT:PC71BM by enhanced PTB7-Th solution aggregation to optimize the interpenetrating network

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 17913-17922 ◽  
Author(s):  
Bin Tang ◽  
Jiangang Liu ◽  
Xinxiu Cao ◽  
Qiaoqiao Zhao ◽  
Xinhong Yu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Liquid Phase ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Liquid Phase Separation ◽  
Current Understanding ◽  
Interpenetrating Network ◽  
Solution Aggregation ◽  
Liquid Liquid Phase Separation

The current understanding of the active layer morphology in ternary organic solar cells (OSCs) is superficial owing to more variables and complexity compared to that of binary OSCs.

Vertically Optimized Phase Separation with Improved Exciton Diffusion Enables High-Efficiency Organic Solar Cells with Thick Active Layers

2021 ◽  
Author(s):  
Yanming Sun ◽  
Yunhao Cai ◽  
Qian Li ◽  
Guanyu Lu ◽  
Hwa Sook Ryu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Diffusion Length ◽  
Active Layer Thickness ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Active Layers

Abstract The development of high-performance organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, a record high efficiency of 17.31% (certified value of 16.9%) was obtained for the 300 nm-thick OSC, with an unprecedented short-circuit current density of 28.36 mA cm−2, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows a record efficiency of 15.21%. This work provides new insights into the fabrication of high-efficiency OSCs with thick active layers.

Molecular Ordering and Phase Segregation Induced by a Volatile Solid Additive for Highly Efficient All-Small-Molecular Organic Solar Cells

2020 ◽  
Author(s):  
Shanshan Chen ◽  
Junfeng Ye ◽  
Qianguang Yang ◽  
Jiyeon Oh ◽  
Dingqin Hu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Phase Segregation ◽  
Morphology Control ◽  
Volatile Solid ◽  
Trade Off ◽  
Molecular Ordering ◽  
Solid Additive

Morphology control remains a major challenge for all-small-molecular organic solar cells (ASM OSCs), mainly reflecting in the elusive trade-off between the molecular ordering and phase separation of the active layer....

Hetero aromatic donors as effective terminal groups for DPP based organic solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 9023-9036 ◽  
Author(s):  
Marri Anil Reddy ◽  
CH. Pavan Kumar ◽  
Akudari Ashok ◽  
Abhishek Sharma ◽  
G. D. Sharma ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Donor Acceptor

Phenoxazine and carbazole end-capped donor–acceptor–donor (D–A–D) based small moleculesCSDPP5–CSDPP8have been synthesized. The device withCSDPP6:PC71BM as active layer exhibited a PCE of 4.69%.

Nanoscale Phase Separation in Ternary Organic Solar Cells Based on PTB7:PC70BM:IC70BA

2021 ◽  
Vol 21 (11) ◽  
pp. 5749-5755
Author(s):  
Chang Li ◽  
Wei Li ◽  
Xiaoxiang Sun ◽  
Jifei Wang ◽  
Jiayou Tao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Short Circuit ◽  
Weight Ratio ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Hole Transport ◽  
Fullerene Derivative

As a fullerene derivative, IC70BA is widely used in the ternary organic solar cells (TOSCs) to increase the open circuit voltage (Voc) of the devices. Unfortunately, most of the literature shows that IC70BA will lead to a reduction in the short-circuit current density (Jsc) and fill factor (FF). In this work, IC70BA is added to the PTB7:PC70BM binary system to form the ternary system, which is composed of one donor and two fullerene acceptors. Surprisingly, the addition of IC70BA does not immediately lead to a decrease in Jsc and FF. In fact, the appropriate weight ratio of IC70BA in fullerenes can simultaneously increase the Voc, Jsc, and FF of the TOSCs. The synergistic optimization of the surface and bulk morphology of the ternary active layer suppresses the attenuation of Jsc and FF. The smooth surface and suitable phase separation size effectively guarantee the separation, transport and extraction of the charge. Moreover, the addition of IC70BA can significantly improve the hole transport capacity of the active layer, and the optimal hole mobility is 5.13 – 10”4 cm2V–1S–1. Finally, the TOSCs with 10% weight ratio of IC70BA gives the optimal PCE of 9.24% and ideality factor of 2.3.

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.

Enhanced power-conversion efficiency in organic solar cells incorporating copolymeric phase-separation modulators

2018 ◽  
Vol 6 (9) ◽  
pp. 3884-3894 ◽  
Author(s):  
C. Sartorio ◽  
V. Campisciano ◽  
C. Chiappara ◽  
S. Cataldo ◽  
M. Scopelliti ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Device Efficiency ◽  
Donor Acceptor ◽  
Plastic Solar Cells

Fullerene–oligothiophene copolymers acting as donor/acceptor segregation modulators improve the device efficiency, giving the highest values for P3HT:PCBM plastic solar cells.

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