In
comparison with monocomponent perovskite single crystals, the
heterojunctions of perovskite single crystals provide great chances
to tune the optoelectronic properties. In this work, we develop an
in situ solution growth approach to fabricate perovskite single-crystal
heterojunctions with different compositions, which are MAPbCl3@MAPbBr3, CsPbBr3@MAPbBr3, and CsPbBr3@MAPbCl3. It was found that the
as-formed gradient interface with mixed halogen components plays an
important role in releasing the lattice mismatch for the in situ growth.
Benefiting from the quasi-type II-like energy level alignment between
MAPbCl3 and MAPbBr3 single-crystal counterparts,
the heterojunction-based device exhibited an enhanced responsivity
of 0.28 mA/W and a specific detectivity of over 109 Jones
under the photovoltaic working mode even with a 1 mm electrode distance.
This work provides a facile route to fabricate functional perovskite
single crystals with rational design for photodetection applications.
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