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High-Performance Regular Perovskite Solar Cells Employing Low-Cost Poly(ethylenedioxythiophene) as a Hole-Transporting Material

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ABSTRACT

Herein, we successfully applied a facile in-situ solid-state synthesis of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) as a HTM, directly on top of the perovskite layer, in conventional mesoscopic perovskite solar cells (PSCs) (n-i-p structure). The fabrication of the PEDOT film only involved a very simple in-situ solid-state polymerisation step from a monomer 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) made from a commercially available and cheap starting material. The ultraviolet photoelectron spectroscopy (UPS) demonstrated that the as-prepared PEDOT film possesses the highest occupied molecular orbital (HOMO) energy level of −5.5 eV, which facilitates an effective hole extraction from the perovskite absorber as confirmed by the photoluminescence measurements. Optimised PSC devices employing this polymeric HTM in combination with a low-cost vacuum-free carbon cathode (replacing the gold), show an excellent power conversion efficiency (PCE) of 17.0% measured at 100 mW cm−2 illumination (AM 1.5G), with an open-circuit voltage (Voc) of 1.05 V, a short-circuit current density (Jsc) of 23.5 mA/cm2 and a fill factor (FF) of 0.69, respectively. The present finding highlights the potential application of PEDOT made from solid-state polymerisation as a HTM for cost-effective and highly efficient PSCs.

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(a) Schematic device architecture of perovskite solar cells studied. (b) Cross-sectional SEM image of the complete PSC device containing FTO glass/compact TiO2/mesoporous TiO2/perovskite/PEDOT/Carbon.
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f4: (a) Schematic device architecture of perovskite solar cells studied. (b) Cross-sectional SEM image of the complete PSC device containing FTO glass/compact TiO2/mesoporous TiO2/perovskite/PEDOT/Carbon.

Mentions: We further applied PEDOT film fabricated from solid-state synthesis, as a HTM in mesoscopic PSCs. The schematic illustration and cross-sectional SEM image of the device architecture are depicted in Fig. 4a and b. The solar cell devices were fabricated with a structure of FTO glass/compact TiO2 (~30–40 nm)/mesoporous TiO2 (~150 nm)/perovskite/HTM/Carbon. The mixed-cations perovskite light absorber (FAPbI3)0.85(MAPbBr3)0.15 was prepared by using a solvent-engineering technique as reported previously by Seok et al.40. Perovskite crystals grew inside the pores of TiO2 scaffold and additionally formed a capping layer with a total thickness of about 600 nm. The XRD and UV-vis spectra of fabricated mixed cation perovskite are presented in Figs S2 and S3, respectively, in the SI. The resulting perovskite films were spin-coated with a layer of monomer DBEDOT. Finally, a low-cost vacuum free carbon cathode was deposited on top of the PEDOT layer by doctor-blading method as reported previously495051. PEDOT HTM layer was formed in between perovskite absorber layer and carbon cathode.


High-Performance Regular Perovskite Solar Cells Employing Low-Cost Poly(ethylenedioxythiophene) as a Hole-Transporting Material
(a) Schematic device architecture of perovskite solar cells studied. (b) Cross-sectional SEM image of the complete PSC device containing FTO glass/compact TiO2/mesoporous TiO2/perovskite/PEDOT/Carbon.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304166&req=5

f4: (a) Schematic device architecture of perovskite solar cells studied. (b) Cross-sectional SEM image of the complete PSC device containing FTO glass/compact TiO2/mesoporous TiO2/perovskite/PEDOT/Carbon.
Mentions: We further applied PEDOT film fabricated from solid-state synthesis, as a HTM in mesoscopic PSCs. The schematic illustration and cross-sectional SEM image of the device architecture are depicted in Fig. 4a and b. The solar cell devices were fabricated with a structure of FTO glass/compact TiO2 (~30–40 nm)/mesoporous TiO2 (~150 nm)/perovskite/HTM/Carbon. The mixed-cations perovskite light absorber (FAPbI3)0.85(MAPbBr3)0.15 was prepared by using a solvent-engineering technique as reported previously by Seok et al.40. Perovskite crystals grew inside the pores of TiO2 scaffold and additionally formed a capping layer with a total thickness of about 600 nm. The XRD and UV-vis spectra of fabricated mixed cation perovskite are presented in Figs S2 and S3, respectively, in the SI. The resulting perovskite films were spin-coated with a layer of monomer DBEDOT. Finally, a low-cost vacuum free carbon cathode was deposited on top of the PEDOT layer by doctor-blading method as reported previously495051. PEDOT HTM layer was formed in between perovskite absorber layer and carbon cathode.

View Article: PubMed Central - PubMed

ABSTRACT

Herein, we successfully applied a facile in-situ solid-state synthesis of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) as a HTM, directly on top of the perovskite layer, in conventional mesoscopic perovskite solar cells (PSCs) (n-i-p structure). The fabrication of the PEDOT film only involved a very simple in-situ solid-state polymerisation step from a monomer 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) made from a commercially available and cheap starting material. The ultraviolet photoelectron spectroscopy (UPS) demonstrated that the as-prepared PEDOT film possesses the highest occupied molecular orbital (HOMO) energy level of −5.5 eV, which facilitates an effective hole extraction from the perovskite absorber as confirmed by the photoluminescence measurements. Optimised PSC devices employing this polymeric HTM in combination with a low-cost vacuum-free carbon cathode (replacing the gold), show an excellent power conversion efficiency (PCE) of 17.0% measured at 100 mW cm−2 illumination (AM 1.5G), with an open-circuit voltage (Voc) of 1.05 V, a short-circuit current density (Jsc) of 23.5 mA/cm2 and a fill factor (FF) of 0.69, respectively. The present finding highlights the potential application of PEDOT made from solid-state polymerisation as a HTM for cost-effective and highly efficient PSCs.

No MeSH data available.


Related in: MedlinePlus