Efficient all polymer solar cells employing donor polymer based on benzo[1,2-b:4,5-b’]dithiophene unit
Source abstract
Abstract
We reported all polymer solar cells (all-PSCs) employing BDT-based donor–acceptor (D–A) polymers composed of benzo[1,2-b:4,5-b’]dithiophene (BDT) and thiadiazolo[3,4-c]pyridine (PyTZ) (PBPT-8 and PBPT-12) as donor and NDI-based n-type polymer Poly{[N,N’-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5’-(2,2’-bithiophene)} (P(NDI2OD-T2)) (N2200) as acceptor. The influence of thermal annealing on the performance of all-PSCs was systematically investigated and discussed. It was found that the pre-annealing of the active blend films could significantly improve the all-PSCs performance. Both PBPT-8/PBPT-12:N2200 systems can deliver promising PCEs (4.12% and 4.25%) at the optimal annealing temperature of 160 oC due to the promoted film quality and charge transport properties. Morphology investigation and carrier mobility measurements have been carried out to analyze the effect of thermal annealing. This study suggests that BDT-based polymer:N2200 systems can be promising candidates for all-PSCs, with thermal annealing as an effective approach to promote the device performance.
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Research context
OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Thin-Film Transistor Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University 1 Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, , Suzhou, Jiangsu 215123, China
Institute of New Energy Technology, Ningbo Institute of Materials Technology and Engineering (NIMTE) 2 , Chinese Academy of Science (CAS), Ningbo, Zhejiang 315201, China
References (35)
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35. See supplementary material at http://dx.doi.org/10.1063/1.4935870 for TGA curves of polymer PBPT-8 and PBPT-12 (Fig. S1); different parameters of the all-PSCs as a function of pre-annealing temperatures (Fig. S2); External quantum efficiency of PBPT-8:N2200 and PBPT-12:N2200 active blend based all-PSCs with different annealing temperatures (Fig. S3); electron mobility in PBPT-12:N2200 blended films as a function of annealing temperatures (Fig. S4); differential transmission spectra of a neat PBPT-12 film and a neat N2200 film at different time delays between the pump and the probe pulses, using probing pulses in the range of 500-1000 nm and pump pulses at 800 nm (Fig. S5); comparison of the normalized ΔT/T dynamics in the neat a neat PBPT-12 film and a neat N2200 film with the probe wavelength of 500 nm, 650 nm and 1000nm (Fig. S6); comparison of the normalized ΔT/T dynamics in the neat PBPT-12 film, neat N2200 film and PBPT-12:N2200 blended film with the probe wavelength of 850 nm; 900 nm; 950 nm and 1000nm (Fig. S7); Atomic force microscope height images (5 μm × 5 μm) of PBPT-12:N2200 blended films. (a), (b) and (c) annealed at 160oC for 10 minutes; (d), (e) and (e) non-treated (Fig. S8) ; The fluorescence lifetime of PBPT-12:N2200 blends based all-PSCs in different annealing temperature (Table S1).