Ternary organic solar cells: compatibility controls for morphology evolution of active layers

2017 ◽  
Vol 5 (41) ◽  
pp. 10801-10812 ◽  
Author(s):  
Qingyun Ai ◽  
Weihua Zhou ◽  
Lin Zhang ◽  
Liqiang Huang ◽  
Jingping Yin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Morphology Evolution ◽  
Active Layers

Compatibility between components described by Flory–Huggins parameters controls morphology evolution in ternary organic solar cells.

In-situ investigation of the bulk heterojunction formation processes in the active layers of organic solar cells

2015 ◽  
Vol 10 (7-8) ◽  
pp. 600-605 ◽  
Author(s):  
K. Kvamen ◽  
S. Grigoryan ◽  
D. V. Anokhin ◽  
V. A. Bataev ◽  
A. I. Smirnov ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Formation Processes ◽  
Active Layers ◽  
In Situ Investigation

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.

scholarly journals Tail state limited photocurrent collection of thick photoactive layers in organic solar cells

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jiaying Wu ◽  
Joel Luke ◽  
Harrison Ka Hin Lee ◽  
Pabitra Shakya Tuladhar ◽  
Hyojung Cha ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Kelvin Probe ◽  
Doping Density ◽  
Efficient Operation ◽  
Tail State ◽  
Active Layers ◽  
Efficient Charge

AbstractWe analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells.

Impact of the Electron Acceptor Nature on the Durability and Nanomorphological Stability of Bulk Heterojunction Active Layers for Organic Solar Cells

Small ◽  
2020 ◽  
pp. 2004168
Author(s):  
Varun Vohra ◽  
Yumi Matsunaga ◽  
Tomoaki Takada ◽  
Ayumu Kiyokawa ◽  
Luisa Barba ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Acceptor ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Active Layers

scholarly journals Fine Optimization of Morphology Evolution Kinetics with Binary Additives for Efficient Non‐Fullerene Organic Solar Cells

2019 ◽  
Vol 6 (6) ◽  
pp. 1801560 ◽  
Author(s):  
Jianya Chen ◽  
Zhaozhao Bi ◽  
Xianbin Xu ◽  
Qianqian Zhang ◽  
Shengchun Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Morphology Evolution

scholarly journals All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Ruimin Zhou ◽  
Zhaoyan Jiang ◽  
Chen Yang ◽  
Jianwei Yu ◽  
Jirui Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Photovoltaic System ◽  
Active Layers ◽  
Donor Acceptor

AbstractThe high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930 nm along with our home-designed small molecule is selected as electron acceptors. To the best of our knowledge, the binary all-small-molecule OSCs achieve the highest efficiency of 14.34% by optimizing their hierarchical morphologies, in which the donor or acceptor rich domains with size up to ca. 70 nm, and the donor crystals of tens of nanometers, together with the donor-acceptor blending, are proved coexisting in the hierarchical large domain. All-small-molecule photovoltaic system shows its promising for high performance OSCs, and our study is likely to lead to insights in relations between bulk heterojunction structure and photovoltaic performance.

scholarly journals Erratum to: “In-situ investigation of the bulk heterojunction formation processes in the active layers of organic solar cells”

2016 ◽  
Vol 11 (3-4) ◽  
pp. 263-263
Author(s):  
K. Kvamen ◽  
S. Grigoryan ◽  
D. V. Anokhin ◽  
V. A. Bataev ◽  
A. I. Smirnov ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Formation Processes ◽  
Active Layers ◽  
In Situ Investigation
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