Electrical Performance of Organic Solar Cells with Additive-Assisted Vertical Phase Separation in the Photoactive Layer

In this article, the improvement in electrical performance of poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) as the transparent electrode doped with different additives (ethylene glycol (EG), isopropyl alcohol) or treatment of sulfuric acid was enhanced that organic solar cells (OSCs) were produced by using poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C61 butyric acid methyl ester. OSCs were fabricated by the doped or treated PEDOT:PSS films as transparent electrodes. The photoelectrical measurements were carried out and the effects of doping or treatment were compared. As a result, EG-added PEDOT:PSS electrode showed the best power conversion efficiency value of 1.87% among the PEDOT:PSS anodes.

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Surface doping of non-fullerene photoactive layer by soluble polyoxometalate for printable organic solar cells

Chemical Communications ◽

10.1039/d1cc00032b ◽

2021 ◽

Author(s):

Lin Hu ◽

Wen You ◽

Lulu Sun ◽

Shen Yu ◽

Mengyuan Yang ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Effective Surface ◽

Photoactive Layer ◽

Surface Doping ◽

Immersion Technique

The non-fullerene photoactive layer can be induced an effective surface p-doping via polyoxometalate (PMA) solution immersion technique, making the device work efficiently although without an additional evaporated MoO3 hole-collecting layer.

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Rational compatibility in ternary matrix enables all-small-molecule organic solar cells with over 16% efficiency

Energy & Environmental Science ◽

10.1039/d1ee00496d ◽

2021 ◽

Author(s):

Mengyun Jiang ◽

Hairui Bai ◽

Hongfu Zhi ◽

Lu Yan ◽

Han Young Woo ◽

...

Keyword(s):

Solar Cells ◽

Phase Separation ◽

Small Molecule ◽

Organic Solar Cells ◽

Charge Generation ◽

Molecular Arrangement ◽

Efficient Charge

How to manipulate the phase separation and molecular arrangement to meet the need of efficient charge generation and extraction remains as the long-standing challenge in all-small-molecule organic solar cells (ASM-OSCs)....

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

10.21203/rs.3.rs-952325/v1 ◽

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.

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