Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77641
Title: Stable and efficient organo-metal halide hybrid perovskite solar cells via π-conjugated lewis base polymer induced trap passivation and charge extraction
Authors: Qin, PL 
Yang, G 
Ren, ZW 
Cheung, SH 
So, SK 
Chen, L
Hao, J
Hou, J
Li, G 
Keywords: Charge extraction
Grain boundary
Hydrophobicity
Perovskite solar cells
Trap passivation
Issue Date: 2018
Publisher: Wiley-VCH
Source: Advanced materials, 2018, v. 30, no. 12, 1706126 How to cite?
Journal: Advanced materials 
Abstract: High-quality pinhole-free perovskite film with optimal crystalline morphology is critical for achieving high-efficiency and high-stability perovskite solar cells (PSCs). In this study, a p-type π-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)-benzo[1,2-b:4,5-b′] dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl) benzo[1′,2′-c:4′,5′-c′] dithiophene-4,8-dione))] (PBDB-T) is introduced into chlorobenzene to form a facile and effective template-agent during the anti-solvent process of perovskite film formation. The π-conjugated polymer PBDB-T is found to trigger a heterogeneous nucleation over the perovskite precursor film and passivate the trap states of the mixed perovskite film through the formation of Lewis adducts between lead and oxygen atom in PBDB-T. The p-type semiconducting and hydrophobic PBDB-T polymer fills in the perovskite grain boundaries to improve charge transfer for better conductivity and prevent moisture invasion into the perovskite active layers. Consequently, the PSCs with PBDB-T modified anti-solvent processing leads to a high-efficiency close to 20%, and the devices show excellent stability, retaining about 90% of the initial power conversion efficiency after 150 d storage in dry air.
URI: http://hdl.handle.net/10397/77641
ISSN: 0935-9648
EISSN: 1521-4095
DOI: 10.1002/adma.201706126
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