Abstract:
:Metal halide perovskite semiconductors possess outstanding characteristics for optoelectronic applications including but not limited to photovoltaics. Low-dimensional and nanostructured motifs impart added functionality which can be exploited further. Moreover, wider cation composition tunability and tunable surface ligand properties of colloidal quantum dot (QD) perovskites now enable unprecedented device architectures which differ from thin-film perovskites fabricated from solvated molecular precursors. Here, using layer-by-layer deposition of perovskite QDs, we demonstrate solar cells with abrupt compositional changes throughout the perovskite film. We utilize this ability to abruptly control composition to create an internal heterojunction that facilitates charge separation at the internal interface leading to improved photocarrier harvesting. We show how the photovoltaic performance depends upon the heterojunction position, as well as the composition of each component, and we describe an architecture that greatly improves the performance of perovskite QD photovoltaics.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhao Q,Hazarika A,Chen X,Harvey SP,Larson BW,Teeter GR,Liu J,Song T,Xiao C,Shaw L,Zhang M,Li G,Beard MC,Luther JMdoi
10.1038/s41467-019-10856-zsubject
Has Abstractpub_date
2019-06-28 00:00:00pages
2842issue
1issn
2041-1723pii
10.1038/s41467-019-10856-zjournal_volume
10pub_type
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