Design, Application, and Morphology Study of a New Photovoltaic Polymer with Strong Aggregation in Solution State

Qian, Deping; Ye, Long; Zhang, Maojie; Liang, Yongri; Li, Liangjie; Huang, Ye; Guo, Xia; Zhang, Shaoqing; Tan, Zhan’ao; Hou, Jianhui

doi:10.1021/ma301900h

Cited by 704 publications

(611 citation statements)

References 40 publications

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“…PFBDB-T was synthesized using a similar synthetic route to PBDB-T (Scheme S1, Supporting Information). [25] PBDB-T and PFBDB-T had number average molecular weights (M n ) of 23 and 26 kDa, and dispersity (Ð) of 2.1 and 2.6, respectively, allowing an accurate comparison of their properties.…”

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confidence: 99%

An Alkylated Indacenodithieno[3,2‐b]thiophene‐Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses

et al. 2018

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The development of nonfullerene acceptors (NFAs), which are used to replace fullerene derivatives in organic solar cells (OSCs) due to their extended light absorption and tunable energy levels, has seen impressive progress in the past few years. [1][2][3][4] A range of new NFAs with different building blocks and geometrical dimensions has been designed to boost the power conversion efficiency (PCE) of OSCs. Among the highest performing NFAs, linear rod-like acceptor-donor-acceptor (A-D-A) structures incorporating fused ladder-type aromatics have attracted much interest. Common donor units include 4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene (IDT) [5][6][7][8][9] and 6,12-dihydro-dithienoindeno [10][11][12][13][14][15][16][17][18] In both cases, the fused core facilitates π-electron delocalization and improves the π-π stacking between molecules, hence enhancing the intrinsic charge carrier mobility.In 2015, Zhan and coworkers reported a new NFA, 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11--b′]dithiophene (ITIC) (Scheme 1), which is comprised an electron-donating IDTT-based core flanked by two electron-withdrawing units of 1,1-dicyanomethylene-3-indanone (IC), that exhibited a promising PCE of 6.8% at that time. [10] Since then, many strategies have been applied to modify the structure of ITIC in order to adjust the absorption spectra and energy levels to further improve the PCE, for example, by changing the side chains, [17,18] extending the conjugation length, [19][20][21][22] and substituting the end acceptor groups. [13][14][15][16] To date, a few systems based on these NFAs have achieved a PCE of over 10%. [5,[13][14][15]18,20,22] However, it is noticeable that in all cases these NFAs incorporate phenylalkyl or thienylalkyl side chains as the solubilizing groups on the fused core. These aryl-based side chains facilitate the synthesis of the IDTT core under Friedel-Crafts conditions via the formation of stable triaryl cations. However, since the nature of the side chains has a

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An Alkylated Indacenodithieno[3,2‐b]thiophene‐Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses

et al. 2018

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“…The optical, electrochemical, and photovoltaic properties, the molecular packing pattern, and the morphology of the blend fi lms were investigated. Compared with the nonfl uorinated derivative PBDTBDD in Scheme 1 a, PM6 exhibited a similar optical bandgap of ≈1.80 eV and a deeper HOMO level of -5.45 eV (−5.25 eV for PBDTBDD [ 17 ] , which is benefi cial for a high V oc . BHJ PSCs based on PM6 /PC 71 BM with both conventional and inverted device structures were fabricated and showed promising photovoltaic performance: a high V oc of 0.98 V and a PCE of 8% for the conventional devices and up to 9.2% for the inverted devices.…”

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A Large‐Bandgap Conjugated Polymer for Versatile Photovoltaic Applications with High Performance

et al. 2015

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“…Tables S2-S4 and Figure S3 in the Supporting Information. For PBDTT-SF-TT, the best performance was obtained with the mass ratio of 1:1.5 (polymer to PC 71 BM, see Table S2, Supporting Information), with a V oc of 1.00 V, a J sc of 14.79 mA cm For BDT-BDD series of polymers, alkylthiolation on PB1 (also termed as PBDTBDD [37] ) raises its V oc from 0.90 to 0.94 V in its polymer/nonfullerene solar cell due to the resulted deeper HOMO level of PB1-S compared to its structural analog PB1. [27] While in our contribution, fluorination on already alkylthiolated PB1-S furthermore improves the V oc from 0.94 to 0.97 V in its polymer/PCBM devices.…”

Section: Photovoltaic Performance Of Fullerene-based Solar Cellsmentioning

confidence: 99%

Balancing High Open Circuit Voltage over 1.0 V and High Short Circuit Current in Benzodithiophene‐Based Polymer Solar Cells with Low Energy Loss: A Synergistic Effect of Fluorination and Alkylthiolation

Bao

et al. 2017

Advanced Energy Materials

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from over 11% [1,2] and 12% [3] up to over 13% now [4] in either tandem or single junction solar cells from benzo [1,2-b:4,5-b′] dithiophene (BDT)-based polymers as the donor material in photovoltaic (PV) devices, their limiting open-circuit voltage (V oc , below 1.00 V) is still one of the key obstacles to achieve ideally high PV performance with minimized trade-off on another characteristic features of the OPV devices, i.e., the short-circuit current density (J sc ). For the first two single junction polymer solar cells (PSCs) with PBDB-T/3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC) and PBDT-T/IT-M as active layer materials, respectively, their photon energy loss (defined as E Loss = E g − eV oc , [5,6] whereas E g refers to the band gap energy difference between the energy level of highest occupied molecular orbital (HOMO) and lowest unoccupied mole cular orbital (LUMO)) has been pronounced as 0.66 and 0.69 eV, respectively, which is still above the empirically optimized level of 0.60 eV. [7] Despite their breaking PCE values, these nonideally low E Loss still reflect the imperfect molecular design of the PBDB-T backbone structure for ideal control on their HOMO/LUMO levels.

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Design, Application, and Morphology Study of a New Photovoltaic Polymer with Strong Aggregation in Solution State

Cited by 704 publications

References 40 publications

An Alkylated Indacenodithieno[3,2‐b]thiophene‐Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses

An Alkylated Indacenodithieno[3,2‐b]thiophene‐Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses

A Large‐Bandgap Conjugated Polymer for Versatile Photovoltaic Applications with High Performance

Balancing High Open Circuit Voltage over 1.0 V and High Short Circuit Current in Benzodithiophene‐Based Polymer Solar Cells with Low Energy Loss: A Synergistic Effect of Fluorination and Alkylthiolation

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