CHAPTER 5. Design and Synthesis of Small Molecule Donors for High Efficiency Solution Processed Organic Solar Cells

AbstractNonfullerene organic solar cells (OSCs) have achieved breakthrough with pushing the efficiency exceeding 17%. While this shed light on OSC commercialization, high-performance flexible OSCs should be pursued through solution manufacturing. Herein, we report a solution-processed flexible OSC based on a transparent conducting PEDOT:PSS anode doped with trifluoromethanesulfonic acid (CF3SO3H). Through a low-concentration and low-temperature CF3SO3H doping, the conducting polymer anodes exhibited a main sheet resistance of 35 Ω sq−1 (minimum value: 32 Ω sq−1), a raised work function (≈ 5.0 eV), a superior wettability, and a high electrical stability. The high work function minimized the energy level mismatch among the anodes, hole-transporting layers and electron-donors of the active layers, thereby leading to an enhanced carrier extraction. The solution-processed flexible OSCs yielded a record-high efficiency of 16.41% (maximum value: 16.61%). Besides, the flexible OSCs afforded the 1000 cyclic bending tests at the radius of 1.5 mm and the long-time thermal treatments at 85 °C, demonstrating a high flexibility and a good thermal stability.

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Solution-processed small-molecule organic solar cells based on non-aggregated zinc phthalocyanine derivatives: A comparative experimental and theoretical study

Materials Science in Semiconductor Processing ◽

10.1016/j.mssp.2021.105777 ◽

2021 ◽

Vol 129 ◽

pp. 105777

Author(s):

A. Celil Yüzer ◽

Gülbin Kurtay ◽

Tuncay Ince ◽

Semih Yurtdaş ◽

Ersan Harputlu ◽

...

Keyword(s):

Solar Cells ◽

Small Molecule ◽

Organic Solar Cells ◽

Theoretical Study ◽

Zinc Phthalocyanine ◽

Solution Processed

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Star-shaped organic semiconductors with planar triazine core and diketopyrrolopyrrole branches for solution-processed small-molecule organic solar cells

Dyes and Pigments ◽

10.1016/j.dyepig.2014.12.007 ◽

2015 ◽

Vol 115 ◽

pp. 35-49 ◽

Cited By ~ 24

Author(s):

Sheng-Yi Shiau ◽

Chun-Ho Chang ◽

Wei-Jen Chen ◽

Hsing-Ju Wang ◽

Ru-Jong Jeng ◽

...

Keyword(s):

Solar Cells ◽

Organic Semiconductors ◽

Small Molecule ◽

Organic Solar Cells ◽

Solution Processed

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A crystalline D-π-A organic small molecule with naphtho[1,2-b:5,6-b′]dithiophene-core for solution processed organic solar cells

Organic Electronics ◽

10.1016/j.orgel.2012.09.019 ◽

2012 ◽

Vol 13 (12) ◽

pp. 3183-3194 ◽

Cited By ~ 26

Author(s):

Pranabesh Dutta ◽

Hanok Park ◽

Woo-Hyoung Lee ◽

In-Nam Kang ◽

Soo-Hyoung Lee

Keyword(s):

Solar Cells ◽

Small Molecule ◽

Organic Solar Cells ◽

Solution Processed

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Simple-structured small molecule acceptors constructed by a weakly electron-deficient thiazolothiazole core for high-efficiency non-fullerene organic solar cells

Journal of Materials Chemistry A ◽

10.1039/c8ta09370a ◽

2018 ◽

Vol 6 (47) ◽

pp. 24267-24276 ◽

Cited By ~ 25

Author(s):

Wenhong Peng ◽

Guangjun Zhang ◽

Lin Shao ◽

Chao Ma ◽

Bin Zhang ◽

...

Keyword(s):

Solar Cells ◽

Small Molecule ◽

Organic Solar Cells ◽

High Efficiency ◽

Novel Strategy

A novel strategy is proposed to construct simple-structured SMAs using a weakly electron-deficient thiazolothiazole (TTz) core. The highest PCE of 8.77% is recorded for TTz1-based OSCs, which is the highest efficiency to date among non-fullerene OSCs with simple-structured SMAs.

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