N-alkyl chain modification in dithienobenzotriazole unit enabled efficient polymer donor for high-performance non-fullerene solar cells

Xu, Jiaxin; Feng, Hexiang; Liang, Yuanying; Tang, Haoran; Tang, Yixu; Du, Zurong; Hu, Zhicheng; Huang, Fei; Cao, Yong

doi:10.1016/j.jechem.2021.08.033

Cited by 15 publications

(16 citation statements)

References 62 publications

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“…The slope “n” extracted from the fitting of the curves with the expression V oc = (nkT/q) ln ( P in ), gives the information about the degree of the trap‐assisted recombination in the PSCs. [ 55,56 ] The lower slope value for P130 :Y6‐based device (1.28 kT/q) than P131 :Y6 (1.38 kT/q), indicates that copolymer with F‐BTz successfully reduced the trap‐assisted recombination in the BHJ‐PSCs.…”

Section: Resultsmentioning

confidence: 99%

New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

Keshtov

Kuklin

Khokhlov

et al. 2022

Macromol. Rapid Commun.

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A new acceptor unit anthra[1,2-b: 4,3-b': 6,7-c'']trithiophene-8,12-dione (А3Т) (A2) is synthesized and used to design D-A 1 -D-A 2 medium bandgap donor copolymers with same thiophene (D) and A2 units but different A1, i.e., fluorinated benzothiadiazole (F-BTz) and benzothiadiazole (BTz) denoted as P130 and P131, respectively. Their detailed optical and electrochemical properties are examined. The copolymers show good solubility in common organic solvents, broad absorption in the visible spectral region from 300 to 700 nm, and deeper HOMO levels of −5.45 and −5.34 eV for P130 and P131, respectively. Finally, an optimized polymer solar cell (PSC) based on P131 as the donor and narrow bandgap non-fullerene small molecule acceptor Y6 demonstrated a power conversion efficiency (PCE) of >11.13%. To further improve the efficiency of the non-fullerene PSC, the P130 is optimized by introducing a fluorine atom into the BTz unit, F-BTz acceptor unit, and PCE PSC based on P130: Y6 active layer increased to >15.28%, which is higher than that for the non-fluorinated analog P131:Y6. The increase in the PCE for former PSC is attributed to the more crystalline nature and compact 𝝅-𝝅 stacking distance, leading to more balanced charge transport and reduced charge recombination. These remarkable results demonstrate that A3T-based copolymer P130 with F-BTz as the second acceptor is a promising donor material for high-performance PSCs.

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Section: Resultsmentioning

confidence: 99%

New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

Keshtov

Kuklin

Khokhlov

et al. 2022

Macromol. Rapid Commun.

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“…The crystallinity and molecular stacking behaviors of the pure and blend films were further studied via grazing‐incidence wide angle X‐ray scattering (GIWAXS) analysis [45–48] . The 2D GIWAXS patterns and 1D line cuts of the neat and blend films are shown in Figure 7a–e, and the related parameters are summarized in Table S5.…”

Section: Resultsmentioning

confidence: 99%

“…The crystallinity and molecular stacking behaviors of the pure and blend films were further studied via grazing-incidence wide angle X-ray scattering (GIWAXS) analysis. [45][46][47][48] The 2D GIWAXS patterns and 1D line cuts of the neat and blend films are shown in Figure 7a-e, and the related parameters are summarized in Table S5. Both BTCD-IC and BTCD-2FIC adopted face-on orientation because the introduction of DTBT core is more conducive to the face-on orientation of molecules.…”

Section: Chemsuschemmentioning

confidence: 99%

Exploiting Novel Unfused‐Ring Acceptor for Efficient Organic Solar Cells with Record Open‐Circuit Voltage and Fill Factor

et al. 2022

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Unfused-ring acceptors (UFAs) show bright application prospects in organic solar cells (OSCs) thanks to their easy synthesis, low cost, and good device performance. The selection of central-core building block and suitable side chain are the key factors to achieve high-performance UFAs. Current tremendous endeavors for the development of UFAs mainly concentrate on obtaining higher short-circuit current density (J sc ), albeit accompanied by low open-circuit voltage (V oc ) and modest fill factor (FF). Herein, two novel AÀ DÀ A'À DÀ A type UFAs (BTCD-IC and BTCD-2FIC), which have the same new electron-withdrawing central-core dithieno [3',2':3,4;2'',3'':5,6]-benzo[1,2c][1,2,5]thiadia-zole (DTBT) and cyclopentadithiophene unit (CPDT, substituted by 2-butyl-1-octyl alkyl chain) coupling with different terminals, were designed and synthesized. Two UFAs showed strong and broad light absorption in the wavelength range of 300-850 nm owing to the strong intramolecular charge transfer effect favorable by DTBT core. Compared with BTCD-IC, BTCD-2FIC with F-containing terminal group exhibited higher molar extinction coefficient, lower energy level, higher charge mobility, stronger crystallinity, more ordered molecular stacking, and better film morphology. As a result, when blended with donor polymer PBDB-T (poly [(2,6-(4,8-bis(5-(2-ethylhexyl)), the BTCD-2FIC-based OSC achieved a superior power conversion efficiency (PCE) of 11.32 %, with a high V oc of 0.85 V, a J sc of 18.24 mA cm À 2 , and a FF of 73 %, than BTCD-IC-based OSC (PCE = 8.96 %). Impressively, the simultaneously enhanced V oc and FF values of the PBDB-T:BTCD-2FIC device were the highest values of the AÀ DÀ A'À DÀ A-type UFAs. The results demonstrate the application of electron-withdrawing DTBT central-core unit in efficient UFAs provides meaningful molecular design guidance for high-performance OSCs.

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“…[7][8][9][10][11][12][13][14] Meanwhile, although their development relatively lags, polymer donors show great prospects. [15][16][17][18][19][20] Generally, both the main skeleton design and precise selection of side chains are of vital importance in the construction of high-performance donor materials. Side chains are critical for improving polymer solubility and for influencing molecular stacking.…”

Section: Introductionmentioning

confidence: 99%

“…7–14 Meanwhile, although their development relatively lags, polymer donors show great prospects. 15–20…”

Section: Introductionmentioning

confidence: 99%

Enhanced photovoltaic performance of donor polymers effected by asymmetric π-bridges

Zhong

Xiao

et al. 2022

Polym. Chem.

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N-alkyl chain modification in dithienobenzotriazole unit enabled efficient polymer donor for high-performance non-fullerene solar cells

Cited by 15 publications

References 62 publications

New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

Exploiting Novel Unfused‐Ring Acceptor for Efficient Organic Solar Cells with Record Open‐Circuit Voltage and Fill Factor

Enhanced photovoltaic performance of donor polymers effected by asymmetric π-bridges

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N-alkyl chain modification in dithienobenzotriazole unit enabled efficient polymer donor for high-performance non-fullerene solar cells

Cited by 15 publications

References 62 publications

New Medium Bandgap Donor D‐A1‐D‐A2 Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

New Medium Bandgap Donor D‐A1‐D‐A2 Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

Exploiting Novel Unfused‐Ring Acceptor for Efficient Organic Solar Cells with Record Open‐Circuit Voltage and Fill Factor

Enhanced photovoltaic performance of donor polymers effected by asymmetric π-bridges

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New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells

New Medium Bandgap Donor D‐A₁‐D‐A₂ Type Copolymers Based on Anthra[1,2‐b: 4,3‐b“:6,7‐c”'] Trithiophene‐8,12‐dione Groups for High‐Efficient Non‐Fullerene Polymer Solar Cells