TY - JOUR
T1 - Permanent lattice compression of lead-halide perovskite for persistently enhanced optoelectronic properties
AU - Boopathi, Karunakara Moorthy
AU - Martín-García, Beatriz
AU - Ray, Aniruddha
AU - Pina, Joao M.
AU - Marras, Sergio
AU - Saidaminov, Makhsud I.
AU - Bonaccorso, Francesco
AU - Di Stasio, Francesco
AU - Sargent, Edward H.
AU - Manna, Liberato
AU - Abdelhady, Ahmed L.
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2021
Y1 - 2021
N2 - Under mild mechanical pressure, halide perovskites show enhanced optoelectronic properties. However, these improvements are reversible upon decompression, and permanent enhancements have yet to be realized. Here, we report antisolvent-assisted solvent acidolysis crystallization that enables us to prepare methylammonium lead bromide single crystals showing intense emission at all four edges under ultraviolet light excitation. We study structural variations (edge-vs-center) in these crystals using micro-X-ray diffraction and find that the enhanced emission at the edges correlates with lattice compression compared to in the central areas. Time-resolved photoluminescence measurements show much longer-lived photogenerated carriers at the compressed edges, with radiative component lifetimes of ∼1.4 μs, 10 times longer than at the central regions. The properties of the edges are exploited to fabricate planar photodetectors exhibiting detectivities of 3 × 1013 Jones, compared to 5 × 1012 Jones at the central regions. The enhanced lifetimes and detectivities correlate to the reduced trap state densities and the formation of shallower traps at the edges due to lattice compression.
AB - Under mild mechanical pressure, halide perovskites show enhanced optoelectronic properties. However, these improvements are reversible upon decompression, and permanent enhancements have yet to be realized. Here, we report antisolvent-assisted solvent acidolysis crystallization that enables us to prepare methylammonium lead bromide single crystals showing intense emission at all four edges under ultraviolet light excitation. We study structural variations (edge-vs-center) in these crystals using micro-X-ray diffraction and find that the enhanced emission at the edges correlates with lattice compression compared to in the central areas. Time-resolved photoluminescence measurements show much longer-lived photogenerated carriers at the compressed edges, with radiative component lifetimes of ∼1.4 μs, 10 times longer than at the central regions. The properties of the edges are exploited to fabricate planar photodetectors exhibiting detectivities of 3 × 1013 Jones, compared to 5 × 1012 Jones at the central regions. The enhanced lifetimes and detectivities correlate to the reduced trap state densities and the formation of shallower traps at the edges due to lattice compression.
UR - http://www.scopus.com/inward/record.url?scp=85099633049&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.9b02810
DO - 10.1021/acsenergylett.9b02810
M3 - Article
AN - SCOPUS:85099633049
SN - 2380-8195
VL - 5
SP - 642
EP - 649
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 2
ER -