Spiro-fluorene based 3D donor towards efficient organic photovoltaics

Ma, Shuying; Fu, Yingying; Ni, Debin; Mao, Jian; Xie, Zhiyuan; Tu, Guoli

doi:10.1039/c2cc36301a

Cited by 54 publications

(33 citation statements)

References 38 publications

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“…Tu et al reported spiro-uorene based starshaped molecules, SF8TBT, which showed a high PCE of 4.82%, with a FF of 56%. 23 Moreover, a comparable PCE was also achieved for the triphenylamine (TPA) based molecule N(Ph-2T-DCN-Me) 3 (ref. 8a) aer optimizing the alkyl chain position and length and thus reducing the steric hindrance and torsional interactions between D/A units and bithiophene p-bridges.…”

Section: Introductionmentioning

confidence: 93%

A star-shaped D–π–A small molecule based on a tris(2-methoxyphenyl)amine core for highly efficient solution-processed organic solar cells

et al. 2014

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Section: Introductionmentioning

confidence: 93%

A star-shaped D–π–A small molecule based on a tris(2-methoxyphenyl)amine core for highly efficient solution-processed organic solar cells

et al. 2014

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“…[16,17] It is worth noting that the SMAs need to meet two essential conditions when P3HT is used as the donor. [31][32][33][34][35][36] There are many electron-deficient units connected with the central SF unit to construct non-fullerene SMAs, such as benzothiadiazole (BT), [37,38] diketopyrrolopyrrole (DPP), [39][40][41] and perylene diimide (PDI). Secondly, their geometries should be finely engineered to form appropriate blend morphology with P3HT in the active layer.…”

Section: Introductionmentioning

confidence: 99%

Wide Band Gap Non‐Fullerene Small Molecular Acceptors Containing Spirobifluorene and Benzotriazole with Three Different End‐Capped Groups for P3HT‐Based Organic Solar Cells

et al. 2018

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Spirofluorene (SF) and benzo [d][1,2,3]triazole (BTA) have been considered as promising building blocks to construct n-type photovoltaic materials. Herein, three new small molecule acceptors (SMAs) named BTA21, BTA23 and BTA27 with the structure of A 2 ＝A 1 -D-A 1 ＝A 2 have been designed, in which SF and BTA were used as a central unit of D and bridged acceptor unit of A 1 , respectively. In addition, 3-ethylrhodanine, 2-(3-ethyl-4oxothiazolidin-2-ylidene)malononitrile and malononitrile were chosen as terminal acceptor units to modulate the properties of the final SMAs. Three SMAs show wide optical band gaps (E g ) of 2.19, 2.15 and 2.21 eV, respectively, with gradually down-shift of the lowest unoccupied molecular orbital (LUMO) levels in the order of BTA21, BTA23 and BTA27 depending on the electron-withdrawing capability of terminal acceptor units. BTA21 shows great advantages with respect to donor poly(3-hexylthiophene) (P3HT) over BTA23 and BTA27, such as well energy-level matching, complementary absorption and proper morphology. Concequently, P3HT:BTA21 shows the best power conversion efficiency (PCE) value of 3.28% with an open-circuit voltage (V OC ) of 1.02 V, a short-circuit current (J SC ) of 5.45 mA•cm -2 and a fill factor (FF) of 0.59. These results indicate that the terminal acceptor group end-capped in SMAs plays a significant role in controlling their optical, electronic, and photovoltaic properties.Scheme 1 Synthetic routes of three small molecules BTA21, BTA23 and BTA27

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“…In 2012, Ma et al [98] first reported a spirofluorenecored 3D small molecule donor (SF8TBT). Compared with the linear analogue molecule (LF8TBT), the designed spirofluorene structure can enable optimized intermolecular stacking to increase the FF.…”

Section: A-d-a-type 3d Rd-based Nfasmentioning

confidence: 99%

Rhodanine-based nonfullerene acceptors for organic solar cells

Liu¹,

Li²,

Zhao

2019

Sci. China Mater.

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Significant progress on the development of nonfullerene acceptors (NFAs) for organic solar cells (OSCs) has been made in the past several years, and the power conversion efficiency (PCE) exceeding 17% has been already realized based on a tandem non-fullerene device. To date, NFAs with a linearly fused acceptor-donor-acceptor (A-D-A) structure are of great interest, due to their attracting synthetic flexibility and high photovoltaic performance. Rhodanine is one of the most studied electron-withdrawing moieties to construct such AD A type NFAs, and the resulting single-junction OSCs have produced PCEs of~10%. More interestingly, those rhodanine-based NFAs have demonstrated a particularly excellent compatibility with well-known P3HT donor, enabling respectable PCEs over 7%. Thus in this review, we summarize the important advances on rhodanine-based NFAs with a main focus on discussing the molecular design strategies, providing a better understanding of the structure-property relationship for those rhodanine-based NFAs.

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Spiro-fluorene based 3D donor towards efficient organic photovoltaics

Abstract: A novel 3D donor material (SF8TBT) based on spiro-fluorene has been developed. Compared with the corresponding 1D linear molecule, the OPVs of this 3D donor exhibited power conversion efficiencies of 4.82%, much higher than that of 1D small molecules (1.69%).

Cited by 54 publications

References 38 publications

A star-shaped D–π–A small molecule based on a tris(2-methoxyphenyl)amine core for highly efficient solution-processed organic solar cells

A star-shaped D–π–A small molecule based on a tris(2-methoxyphenyl)amine core for highly efficient solution-processed organic solar cells

Wide Band Gap Non‐Fullerene Small Molecular Acceptors Containing Spirobifluorene and Benzotriazole with Three Different End‐Capped Groups for P3HT‐Based Organic Solar Cells

Rhodanine-based nonfullerene acceptors for organic solar cells

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