Rational molecular design of multifunctional self-assembled monolayers for efficient hole selection and buried interface passivation in inverted perovskite solar cells
Self-assembled monolayers (SAMs) have been widely employed as the bottom-contact hole-selective layer (HSL) in inverted perovskite solar cells (PSCs). Besides manipulating the electrical properties, molecularly engineering the SAM provides an opportunity to modulate the perovskite buried interface....
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Published in | Chemical science (Cambridge) Vol. 15; no. 8; pp. 2778 - 2785 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
CAMBRIDGE
Royal Soc Chemistry
22.02.2024
Royal Society of Chemistry The Royal Society of Chemistry |
Subjects | |
Online Access | Get full text |
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Summary: | Self-assembled monolayers (SAMs) have been widely employed as the bottom-contact hole-selective layer (HSL) in inverted perovskite solar cells (PSCs). Besides manipulating the electrical properties, molecularly engineering the SAM provides an opportunity to modulate the perovskite buried interface. Here, we successfully introduced Lewis-basic oxygen and sulfur heteroatoms through rational molecular design of asymmetric SAMs to obtain two novel multifunctional SAMs,
CbzBF
and
CbzBT
. Detailed characterization of single-crystal structures and device interfaces shows that enhanced packing, more effective ITO work function adjustment, and buried interface passivation were successfully achieved. Consequently, the champion PSC employing
CbzBT
showed an excellent power conversion efficiency (PCE) of 24.0% with a high fill factor of 84.41% and improved stability. This work demonstrates the feasibility of introducing defect-passivating heterocyclic groups into SAM molecules to help passivate the interfacial defects in PSCs. The insights gained from this molecular design strategy will accelerate the development of new multifunctional SAM HSLs for efficient PSCs.
Lewis-basic oxygen and sulfur heteroatoms are introduced to novel asymmetric self-assembled monolayers, realizing enhanced packing, effectively adjusting ITO work function, and passivating buried interface in inverted perovskite solar cells. |
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Bibliography: | Electronic supplementary information (ESI) available. CCDC 2298042 For ESI and crystallographic data in CIF or other electronic format see DOI 2298041 https://doi.org/10.1039/d3sc05485c and ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work. |
ISSN: | 2041-6520 2041-6539 |
DOI: | 10.1039/d3sc05485c |