Interfacing green synthesized flake like-ZnO with TiO2 for bilayer electron extraction in perovskite solar cells
Journal article, 2020

To improve the performance of PSCs, it is essential to prevent the carrier recombination losses at the interfaces of the transparent metal oxide electrode/electron transport layer (ETL)/active absorber perovskite layer. This present work reports on the green synthesis approach used for the preparation of flake like-ZnO nanostructure (GF-ZnO NS), naturally extracted from the leaf of Albizia Amara, used as a reducing cum capping agent. Herein, we have introduced an n-type GF-ZnO NS material as an efficient electron transport interfacial layer (bi-ETL) at the ETL/perovskite junction in the fabricated perovskite solar cells (PSCs). The structure of the fabricated PSC device is as follows: glass/ITO/bi-ETL (c-TiO2/GF-ZnO NSs)/CH3NH3PbI3-xClx/spiro-MeOTAD/Au. A comparative study has also been carried out by deploying electron transport materials such as c-TiO2 and GF-ZnO NSs separately. From this, it has been found that the bi-ETL perovskite solar cell devices achieved a maximum power conversion efficiency (PCE) of 7.83% with an open-circuit voltage (VOC) of 0.728 V, a short circuit current density (JSC) of 20.46 mA cm-2 and a fill factor (FF) of 52.61% whereas, the c-TiO2, GF-ZnO NSs and the chemically reduced CR-ZnO ETL based devices achieved a PCE of 4.84%, 5.82% and 6.81%, respectively. The better performance obtained for the bi-ETL based devices is ascribed to the enhanced carrier extraction and the reduced recombination losses at the interface between the ETL and the active perovskite layer.

Author

Selvakumar Pitchaiya

Coimbatore Institute of Technology

Western Norway University of Applied Sciences

Nandhakumar Eswaramoorthy

Vellore Institute of Technology

Muthukumarasamy Natarajan

Coimbatore Institute of Technology

Agilan Santhanam

Coimbatore Institute of Technology

Venkatraman Madurai Ramakrishnan

Western Norway University of Applied Sciences

Coimbatore Institute of Technology

Vijayshankar Asokan

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Pavithrakumar Palanichamy

Coimbatore Institute of Technology

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Balraju Palanisamy

Coimbatore Institute of Technology

Ananthi Kalimuthu

Coimbatore Institute of Technology

Dhayalan Velauthapillai

Western Norway University of Applied Sciences

New Journal of Chemistry

1144-0546 (ISSN) 1369-9261 (eISSN)

Vol. 44 20 8422-8433

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics

DOI

10.1039/d0nj01559h

More information

Latest update

8/6/2020 6