Interface modification using a post-treatment-free heteropolyacid for effective charge selective bilayer formation in perovskite solar cells

• Main Authors: Gopalan Saianand, Anantha Iyengar Gopalan, Vellaisamy A.L. Roy, Gregory J. Wilson, Jaroon Jakmunee, Prashant Sonar, Liangyou Lin, Sae Wan Kim, Shin Won Kang
• Format: Journal
• Published: 2020
• Subjects: Engineering; Materials Science; Physics and Astronomy
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85089263020&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/70549
• Institution: Chiang Mai University

© 2020 We rationally utilized a solution-processed post-heat treatment-free heteropolyacid compound, phosphomolybdic acid hydrate (PMAH) as a charge selective interface modifier for poly(3,4-ethylene dioxythiophene): polystyrene sulfonate (PEDOT:PSS) in inverted perovskite solar cells (PSCs). The fabricated PSCs with PMAH/PEDOT:PSS bilayer exhibited significant improvement in the power conversion efficiency (PCE) (∼12%) with superior long-term air-stability as compared to PEDOT:PSS based PSCs (9.8%). The measured photovoltaic performance demonstrates that the inclusion of PMAH as an interface to ITO and PEDOT:PSS is an efficient way of realizing stable and efficient PSCs.