摘要
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 MAPbCl(3)@MAPbBr(3), CsPbBr3 pMAPbBr(3), and CsPbBr3@MAPbCl(3). 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 MAPbCl(3) and MAPbBr(3) single-crystal counterparts, the heterojunction-based device exhibited an enhanced responsivity of 0.28 mA/W and a specific detectivity of over 10(9) 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.
-
单位北京理工大学; y