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Metal‐Free Phthalocyanine as a Hole Transporting Material and a Surface Passivator for Efficient and Stable Perovskite Solar Cells
Author(s) -
Kim SeungWoo,
Kim Geunjin,
Moon Chan su,
Yang TaeYoul,
Seo Jangwon
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202001248
Subject(s) - perovskite (structure) , phthalocyanine , passivation , thermal stability , materials science , energy conversion efficiency , halide , metal , inorganic chemistry , chemical engineering , optoelectronics , chemistry , nanotechnology , layer (electronics) , metallurgy , engineering
Perovskite solar cells in an n‐i‐p structure record high power conversion efficiency, but issues of insufficient thermal stability and the high cost of p‐type hole transporting materials have been raised as drawbacks. H 2 ‐phthalocyanine (Pc) is introduced as a hole transport material to ensure the thermal stability and simultaneously have served surface passivation effects on hybrid halide perovskites as a Lewis base. Pyrrolic nitrogen in the Pc reacts with uncoordinated Pb 2+ ions on the perovskite surface. Upon enhancing the interfacial interaction between phthalocyanine and the perovskite, the open circuit voltage in devices increases as compared to that of devices using a metal‐phthalocyanine complex. While the phthalocyanine‐applied device maintains superior thermal long‐term stability, the power conversion efficiency also exceeds 20%.