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....

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.

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.

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.

Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance

2020 ◽  
Vol 13 (12) ◽  
pp. 5117-5125
Author(s):  
Linglong Ye ◽  
Yunhao Cai ◽  
Chao Li ◽  
Lei Zhu ◽  
Jinqiu Xu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Photovoltaic Performance ◽  
Volatile Solid ◽  
Solid Additive ◽  
Improved Performance

Ferrocene was introduced as a solid additive in organic solar cells (OSCs). The use of ferrocene provides PM6:Y6 based device with improved performance and stability, demonstrating its great potential in the fabrication of efficient and stable OSCs.

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.

scholarly journals A “σ-Hole”-Containing Volatile Solid Additive Enabling 16.5% Efficiency Organic Solar Cells

iScience ◽  
2020 ◽  
Vol 23 (3) ◽  
pp. 100965 ◽  
Author(s):  
Jiehao Fu ◽  
Shanshan Chen ◽  
Ke Yang ◽  
Sungwoo Jung ◽  
Jie Lv ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Volatile Solid ◽  
Solid Additive
Sign in / Sign up

Export Citation Format

Share Document