Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Yin, Xinxing; An, Qiaoshi; Yu, Jiangsheng; Guo, Fengning; Geng, Yongliang; Bian, Linyi; Xu, Zhongsheng; Zhou, Baojing; Xie, Linghai; Zhang, Fujun; Tang, Weihua

doi:10.1038/srep25355

Cited by 19 publications

(14 citation statements)

References 46 publications

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from both academic and industry because of the advantages of their tunable energy levels, strong absorption in the visible and even near-infrared region (vis-NIR), as well as easy purification compared to their fullerene counterparts (e.g., PC 61 BM [13][14][15] and PC 71 BM [16][17][18][19][20] ). The rapid progress of NFAs has been realized with considerable efforts, resulting in the impressive power conversion efficiencies (PCEs) surpassing 14% [12] in a relative short period of time.

Typically, most of the efficient NFAs are formed through the prevalent strategy using a planar acceptor-donor-acceptor configuration with a strong intramolecular charge transfer (ICT) effect.

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confidence: 99%

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

et al. 2018

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A new electron-rich central building block, 5,5,12,12-tetrakis(4-hexylphenyl)-indacenobis-(dithieno[3,2-b:2',3'-d]pyrrol) (INP), and two derivative nonfullerene acceptors (INPIC and INPIC-4F) are designed and synthesized. The two molecules reveal broad (600-900 nm) and strong absorption due to the satisfactory electron-donating ability of INP. Compared with its counterpart INPIC, fluorinated nonfullerene acceptor INPIC-4F exhibits a stronger near-infrared absorption with a narrower optical bandgap of 1.39 eV, an improved crystallinity with higher electron mobility, and down-shifted highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. Organic solar cells (OSCs) based on INPIC-4F exhibit a high power conversion efficiency (PCE) of 13.13% and a relatively low energy loss of 0.54 eV, which is among the highest efficiencies reported for binary OSCs in the literature. The results demonstrate the great potential of the new INP as an electron-donating building block for constructing high-performance nonfullerene acceptors for OSCs.

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“…

Typically, most of the efficient NFAs are formed through the prevalent strategy using a planar acceptor-donor-acceptor configuration with a strong intramolecular charge transfer (ICT) effect.

…”

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confidence: 99%

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

et al. 2018

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“…The HOMO energy level of donor materials is estimated from E HOMO = E LUMO + E g opt , ( E g opt is the optical band gap obtained from the intersection of their corresponding solution state absorption and emission spectra) and the values are compiled in Table . The HOMO energy level of these donor molecules is lower compared to their OBDT analogues indicating that the extension of conjugation length using the 2D‐BDT design can lead to a deeper HOMO energy level . The introduction of fluorine atoms onto BT unit further lowers the HOMO energy level of the SM donor molecules from −5.60 eV for ICT7 to −5.70 eV for ICT9 .…”

Section: Resultsmentioning

confidence: 97%

Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small‐Molecule Donors for Bulk Heterojunction Solar Cells

et al. 2017

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Small molecule donor materials with varied number of fluorine atoms (zero and four for ICT7 and ICT9, respectively) are synthesized and the influence of the fluorine atom content on their photophysical, electrochemical and thermal properties is studied. With an increase in the number of F atoms, the absorption maximum of the donor material is blue shifted with an increase in the molar extinction coefficient and also, the HOMO (−5.60 and −5.70 eV, respectively, for ICT7 and ICT9) and the LUMO (−3.70 and −3.76 eV, respectively, for ICT7 and ICT9) energy levels are stabilized. Thermal properties, such as melting temperature Tm (223 and 312 °C, respectively, for ICT7 and ICT9) and crystallization temperature Tc (174 and 284 °C, respectively, for ICT7 and ICT9) are significantly enhanced with increasing numbers of fluorine atoms. Solution‐processed bulk heterojunction solar cells (BHJSCs) are fabricated using these two donors along with PC71BM as the acceptor. Under the optimized conditions, they exhibited an overall power conversion efficiency (PCE) of 6.43 % and 8.34 % for ICT7:PC71BM and ICT9:PC71BM active layers, respectively. ICT9 with four F atoms induced a better nanoscale morphology to the active layer, exhibited efficient charge transport and exciton dissociation and resulted in a better PCE of the BHJSCs.

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“…UV-VIS characterization was done by using Analytic Jena Speedcord S600 Spectroscopy. Optic band gap energy of thin films was determined by Equation 1 [28].…”

Section: Characterisation Of Bilayer Tio 2 Filmsmentioning

confidence: 99%

The Optical and Crystallite Characterization of Bilayer TiO₂ Films Coated on Different ITO layers

Kutlu

Oturak

2018

Open Chemistry

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Titanium dioxide(TiO2) is a well-known material which is non-toxic with efficient photoactivity, high stability, low-cost and corrosion-resistant. Up to today’s technology, TiO2 films are coated for various applications in the scientific area. In this study, bilayer TiO2 films were coated on indium tin oxide(ITO) layers that have different characteristic properties. The devices designed as homemade of Direct Current Magnetron Sputtering (DCMS) and Spray Pyrolysis Deposition (SPD) coating methods were used to coat the first and second layers of bilayer TiO2 films, respectively. The optical and crystalline characterizations of bilayer TiO2 films were analyzed by UV-VIS spectroscopy and XRD techniques. The XPS spectrum showed that O2 molecules simply oxidize from Ti3+ to Ti4+ after SPD coating method. The characterization results of TiO2 films showed change in optical band gap value and crystalline structure of TiO2 bilayer.

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Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Cited by 19 publications

References 46 publications

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small‐Molecule Donors for Bulk Heterojunction Solar Cells

The Optical and Crystallite Characterization of Bilayer TiO₂ Films Coated on Different ITO layers

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Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Cited by 19 publications

References 46 publications

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small‐Molecule Donors for Bulk Heterojunction Solar Cells

The Optical and Crystallite Characterization of Bilayer TiO2 Films Coated on Different ITO layers

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The Optical and Crystallite Characterization of Bilayer TiO₂ Films Coated on Different ITO layers