Abstract:Derived from perylenediimide (PDI) building blocks, 3D PDI molecules are considered as a type of promising structure to overcome molecular aggregation, thus improving the performance of organic solar cells. Herein, we report a novel PDI-based derivative, SCPDT-PDI , with four PDI units connected to a unique spiro core. Attributed to this novel molecular design, SCPDT-PDI exhibits a rigid 3D structure, in which the aggregation tendency of PDI chromophores could be effectively attenuated. Additionally, strong in… Show more
“…The ITO-coated glass substrates were washed and pretreated. 28,29 The precursor solution of ZnO was spin-coated onto the ITO glass and annealed (200 °C, 60 min). PTB7-Th:FSP blend solution was spin-coated on the ZnO layer to form the active layer (ca.150 nm) without any thermal or solvent annealing.…”
Section: Methodsmentioning
confidence: 99%
“…28 Our previous work showed that fullerene-free OSCs based on a 3D SM acceptor SCPDT-PDI 4 can reach a modest PCE of 7.11%. 29 SCPDT-PDI 4 is composed of a SCPDT spiro core and four PDI arms, in which two pairs of PDI units are conjugated with CPDT linker. The PDI units take a twisted conformation with a dihedral angle of 59 o relative to the CPDT core.…”
Section: Introductionmentioning
confidence: 99%
“…Atomic Force Microscope (AFM), J-V curves and EQE spectra can be found in our previous papers 28,29. Transmission Electron Microscopy (TEM) images were operated at 200 KeV (bright field mode, Tecnai Bio twin, FEI).…”
A perylenediimide-based (PDI-based) small molecular (SM) acceptor with both an extended π-conjugation and a three-dimensional structure concurrently is critical for achieving high-performance PDI-based fullerene-free organic solar cells (OSCs). Herein, a novel PDI-based SM acceptor has been successfully synthesized through fusing PDI units with a spiro core 4,4'-spirobi[cyclopenta[2,1-b;3,4-b']dithiophene (SCPDT) together via β-position coupling with thiophene bridges. An enhanced absorption from 350 to 520 nm has been observed. Moreover, compared with previously reported acceptor SCPDT-PDI, in which the PDI units and SCPDT are not fused together, the LUMO energy level of FSP (the new SCPDT-based molecule) increases. OSCs containing PTB7-Th as a donor and FSP as an acceptor have been demonstrated to show an excellent performance with a power conversion efficiency as high as 8.89%. This result might be attributed to the efficient and complementary photoabsorption, balanced carrier mobilities, and favorable phase separation in the blend film. This research could offer an effective strategy to design novel high-performance PDI-based acceptors.
“…The ITO-coated glass substrates were washed and pretreated. 28,29 The precursor solution of ZnO was spin-coated onto the ITO glass and annealed (200 °C, 60 min). PTB7-Th:FSP blend solution was spin-coated on the ZnO layer to form the active layer (ca.150 nm) without any thermal or solvent annealing.…”
Section: Methodsmentioning
confidence: 99%
“…28 Our previous work showed that fullerene-free OSCs based on a 3D SM acceptor SCPDT-PDI 4 can reach a modest PCE of 7.11%. 29 SCPDT-PDI 4 is composed of a SCPDT spiro core and four PDI arms, in which two pairs of PDI units are conjugated with CPDT linker. The PDI units take a twisted conformation with a dihedral angle of 59 o relative to the CPDT core.…”
Section: Introductionmentioning
confidence: 99%
“…Atomic Force Microscope (AFM), J-V curves and EQE spectra can be found in our previous papers 28,29. Transmission Electron Microscopy (TEM) images were operated at 200 KeV (bright field mode, Tecnai Bio twin, FEI).…”
A perylenediimide-based (PDI-based) small molecular (SM) acceptor with both an extended π-conjugation and a three-dimensional structure concurrently is critical for achieving high-performance PDI-based fullerene-free organic solar cells (OSCs). Herein, a novel PDI-based SM acceptor has been successfully synthesized through fusing PDI units with a spiro core 4,4'-spirobi[cyclopenta[2,1-b;3,4-b']dithiophene (SCPDT) together via β-position coupling with thiophene bridges. An enhanced absorption from 350 to 520 nm has been observed. Moreover, compared with previously reported acceptor SCPDT-PDI, in which the PDI units and SCPDT are not fused together, the LUMO energy level of FSP (the new SCPDT-based molecule) increases. OSCs containing PTB7-Th as a donor and FSP as an acceptor have been demonstrated to show an excellent performance with a power conversion efficiency as high as 8.89%. This result might be attributed to the efficient and complementary photoabsorption, balanced carrier mobilities, and favorable phase separation in the blend film. This research could offer an effective strategy to design novel high-performance PDI-based acceptors.
“…Next to the Suzuki coupling, it is the most commonly utilized reaction to couple aromatic, in particular, thiophene-based cores with PBI units. It was used to prepare a plethora of aryl-bridged systems consisting of two or more PBI chromophores with linear, 141,142 spiro 143 or other twisted linkers.…”
Section: Replacement Of Halogen Atoms By Stille Sonoghasira and Glasmentioning
“…Currently, non-fullerene acceptor materials, including small molecules and polymers, have strong electron decient units such as naphthalene diimide (NDI), 12,13 perylene diimide (PDI), [14][15][16] diketopyrrolopyrrole (DPP), [17][18][19][20] or other building blocks with electron withdrawing moieties. [21][22][23] Small molecular acceptors are normally believed to be more superior than polymeric acceptors in terms of their purity and small batch to batch variance on synthesis, which is important for industrial scale applications.…”
Three small molecules SBF-1DPPDCV, SBF-2DPPDCV and SBF-4DPPDCV consisting of a spirobifluorene (SBF) unit as the core and one, two, and four diketopyrrolopyrrole dicyanovinyl (DPPDCV) units as the arms have been designed and synthesized for solution-processed bulk-heterojunction (BHJ) solar cells. The UVVis absorption and cyclic voltammetry measurement of these compounds showed that all these compounds have an intense absorption band over 300-750 nm with a LUMO energy level at around À3.87 eV. When pairing with PTB7-Th as the donor, devices fabricated based on PTB7-Th : SBF-4DPPDCV blends showed a decent PCE of 3.85%, which is the highest power conversion efficiency (PCE) amongst the three DPP acceptor fabricated devices without extra treatment. Devices with SBF-1DPPDCV and SBF-2DPPDCV acceptors showed lower PCEs of 0.26% for SBF-1DPPDCV and 0.98% for SBF-2DPPDCVrespectively. The three dimensional (3D) structure of SBF-4DPPDCV facilitates the formation of a 3D charge-transport network and thus enables a rational electron-transport ability (1.04which further leads to a higher J sc (10.71 mA cm
À2). These findings suggest that multi-arm acceptors present better performance than one-arm or two-arm molecules for organic solar cells.
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