Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 49, Pages 42328-42334Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15399
Keywords
perovskite; PTAA; gradient engineering; large-area; carbon-based solar cells
Funding
- Projects of International Cooperation and exchanges NSFC [51561145007]
- National Natural Science Foundation of China [51772166]
- Sino-Italy International Cooperation on Innovation [2016YFE0104000]
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The performance of low-temperature carbon based perovskite solar cells (C-PSCs) with high commercial potential was hampered by the inferior interface between the absorber and carbon electrode. In this work, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) was dissolved in an antisolvent for spin-coating perovskite (CH3NH3PbI3, MAPI) films, which was applied to modify both the MAPI films and the interface between the MAPI layer and carbon electrode by gradient engineering. Finally, the C-PSCs based on MAPI-PTAA gradient bulk heterojunction films achieved a power conversion efficiency of 13.0% with an active area of 1 cm(2), 26% higher than that of pristine MAPI cells, because of the passivated trap states, accelerated hole extraction, and improved crystalline properties in absorber films.
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