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Electron trapping action of functionalized carbon nanotubes and PEDOT: PSS nanocomposite in inverted perovskite solar cell

Publication Type : Conference Proceedings

Publisher : AIP Conference Proceedings

Source : AIP Conference Proceedings 2162 (2019)

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Campus : Amritapuri

School : School of Arts and Sciences

Department : Electronics and Communication, Physics

Year : 2019

Abstract : Organic –inorganic metal halide perovskite light sensitizer is a fast-growing field in photovoltaic which reached a maximum certified efficiency of 22.1%. Contact layer engineering is widely focused areas in the field of perovskite solar cell to increase power conversion efficiency and stability of the cell. PEDOT: PSS is a reliable organic hole transporting material showing intact performance for inverted perovskite solar cell. A nanocomposite of Functionalised multiwalled carbon nanotubes (f-MWCTs) and PEDOT: PSS are functioned as hole transporter. f-MWCTs are taken in two different volume percentages such as 10% volume of PEDOT: PSS, 20% volume of PEDOT: PSS are added to 250µL of PEDOT: PSS to prepare the composite. Transmittance and surface morphology of PEDOT: PSS-f-MWCTs nanocomposite film is analysed. UV-Visible spectrum of MAPbI3 thin film shows an energy gap in between 1.5-1.6eV. In PL-spectrum of MAPbI3 an intense peak is at 428nm. XRD analysis confirms hexagonal phase of MAPbI3. An inverted perovskite solar cell with architecture FTO glass substrate/ PEDOT: PSS-F-MWCTs nanocomposite/ MAPbI3/ TiO2 compact layer/ FTO glass substrate is fabricated and current voltage characterisations are taken. XRD and SEM analysis of TiO2 film is taken. All the synthesis process and fabrication of the cell is carried out at ambient atmospheric conditions. Addition of 20V% of f-MWCTs increase the fill factor to 31% from 21%. MWCTs increase the number of minority carriers in PEDOT: PSS hole conductor. These minority carriers recombine with the positive vacancy formed in the perovskite light absorber. Hence only a smaller number of holes can transfer through PEDOT: PSS. This leads to lowering the value of Isc and retards the performance of the cell.

Cite this Research Publication : A. Albert, Sreelekshmi, N., Jinchu, I., Dr. Sreedevi K Menon, and Dr. Sreekala C. O., “Electron trapping action of functionalized carbon nanotubes and PEDOT: PSS nanocomposite in inverted perovskite solar cell”, AIP Conference Proceedings 2162. 2019.

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