Journal
SOLAR RRL
Volume 5, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100087
Keywords
hole transport materials; n-i-p perovskite solar cells; reduced graphene oxides
Funding
- National Research Foundation of Korea (NRF) - Korea government [NRF-2018R1A2A1A05078791]
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A newly designed alkylated rGO (AF-rGO) with high dispersity in a nonpolar solvent has been synthesized for use as a solution-processed HTM in PeSCs. The AF-rGO exhibits efficient hole extraction and transport abilities in PeSCs, resulting in a maximum PCE of 17%.
Reduced graphene oxides (rGOs), despite their excellent electrical properties, have been seldom used as the solution-processed sole hole transport material (HTM) in perovskite solar cells (PeSCs) with an n-i-p structure, due to their low dispersity in orthogonal solvent of perovskite, such as chlorobenzene (CB). The limited rGO dispersion in nonpolar solvents precludes the formation of a fully covered film on top of the perovskite layer. A newly designed alkylated rGO (AF-rGO) is synthesized, which can be highly dispersed in a nonpolar solvent, for use as a solution-processed HTM on top of the perovskite layer in PeSCs. The AF-rGO can be dispersed in CB at a high concentration, and a fully covered AF-rGO film is successfully introduced on top of the perovskite layer as HTM through a simple solution process. The AF-rGO in the PeSC exhibits minimal series resistance and charge recombination and exhibits efficient hole extraction and transport abilities, resulting in a maximum power conversion efficiency (PCE) of 17%, which is the highest PCE of PeSCs with an n-i-p structure, which use graphene-based materials as the sole HTM. Moreover, devices with AF-rGO HTM exhibit improved ambient stability, exhibiting 89% of their original performance after 240 h of storage without encapsulation.
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