Ambient stable, hydrophobic, electrically conductive porphyrin hole-extracting materials for printable perovskite solar cells

Reddy, G, Katakam, R, Devulapally, K, Jones, L, Della Gaspera, E, Upadhyaya, H, Islavath, N and Giribabu, L 2019, 'Ambient stable, hydrophobic, electrically conductive porphyrin hole-extracting materials for printable perovskite solar cells', Journal of Materials Chemistry C, vol. 7, no. 16, pp. 4702-4708.


Document type: Journal Article
Collection: Journal Articles

Title Ambient stable, hydrophobic, electrically conductive porphyrin hole-extracting materials for printable perovskite solar cells
Author(s) Reddy, G
Katakam, R
Devulapally, K
Jones, L
Della Gaspera, E
Upadhyaya, H
Islavath, N
Giribabu, L
Year 2019
Journal name Journal of Materials Chemistry C
Volume number 7
Issue number 16
Start page 4702
End page 4708
Total pages 7
Publisher Royal Society of Chemistry
Abstract Fundamental properties of organic molecules such as symmetry and conjugation have a major impact on their functional properties and applications. In this study, we designed and synthesized hydrophobic, electrically conductive porphyrin derivatives using N-octyl phenothiazine as the donors and a porphyrin as the π-spacer in a DπD configuration. These materials are candidates for hole transport layers (HTL) within optoelectronic devices, and specifically perovskite solar cells (PSC). Detailed optical, electrical and electrochemical characterization of the porphyrin molecules were used to assess their properties, revealing good conductivity, clear electronic transitions and HOMO energy levels well aligned with the valence band of methylammonium lead iodide, the archetypal absorber in PSCs. We fabricated all-solution processed perovskite devices through screen-printing of the various layers and, adopting a carbon nanoparticlegraphene composite cathode, achieved a high photocurrent density of >19.5 mA cm−2 and power conversion efficiency of >11% for our porphyrin derivatives. In addition, by the introduction of hydrophobic octyl groups on the porphyrin substituents, we could achieve excellent water stability of our devices without the need for encapsulation, confirming the promise of these materials for stable HTLs. Such hydrophobic porphyrin systems will have broad academic and industrial interest for use in photovoltaics, light emitting diodes, photodetectors and other optoelectronic devices.
Subject Synthesis of Materials
Nanomaterials
Photodetectors, Optical Sensors and Solar Cells
DOI - identifier 10.1039/C9TC00605B
Copyright notice This journal is © The Royal Society of Chemistry 2019
ISSN 2050-7534
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