Journal
NANO ENERGY
Volume 77, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105292
Keywords
2D-MoS2; Interface engineering; Dopant-free HTM; Improved stability; Open circuit voltage
Categories
Funding
- European Union H2020 Programme under European Research council Consolidator grant [MOLEMAT] [726360]
- PARASOL from Spanish ministry of Science and Innovation [RTI2018-102292-B-I00]
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Solution-processed photovoltaics employing perovskite as light harvester are the next generation future energy source owing to its low manufacturing cost and potential to achieve high power conversion efficiency. Significant emphasis has been laid on the performance-related investigations, however the long-term instability under operational conditions and device reproducibility obstruct its potential commercial endeavour. Herein, by tweaking the energy level alignment between the hole-transport layer and perovskite, by the placement of a 2D-MoS2 interlayer, we demonstrate suppressed interfacial charge accumulation, fast charge extraction, and subsequently improved photovoltaic performances. Notably, with the usage of a dopant free hole transport materials, a power conversion efficiency of 18.54% with significantly upgraded open circuit voltage (V-oc) and FF was recorded. The stability measurement shows that the resulting 2D-MoS2 supported dopant-free hole selective layers exhibit notable moisture stability under ambient conditions. Our study put forward the profound experimental understanding of 2D-transition metal dichalcogenides as an agent to engineering the interface, enlightening the power conversion efficiency and lifetime of the perovskite solar cells.
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