access icon free Restraining effect of film thickness on the behaviour of amplified spontaneous emission from methylammonium lead iodide perovskite

© The Institution of Engineering and Technology
Received 08/05/2018, Accepted 31/07/2018, Revised 19/07/2018, Published 08/08/2018

The authors report amplified spontaneous emission (ASE) behaviour from methylammonium lead iodide (CH3NH3PbI3) perovskite films of different thicknesses. The ASE threshold carrier density noticeably decreased with thickness, indicating the existence of different traps with perovskite films of smaller thicknesses. We attribute this behaviour to the presence of surface states, whose origin can result from different practical fabrication steps with samples of small thicknesses. The ASE threshold carrier density increased from 3.29 × 1018 cm−3 at a film thickness of 650 nm to 7.73 × 1018 cm−3 at a film thickness of 80 nm. This work warns that while decreasing the film thickness is of practical importance to reduce the ASE threshold pump current, e.g. in electrically driven light-emitting diodes, the solution processing of perovskites, newly re-discovered for their potential photonic and photovoltaic applications, can be a restraining factor. Band gap renormalisation (BGR) is also observed in the prepared films as a redshift in the ASE peak with increasing the pump power, and the BGR coefficient is estimated to be ∼ 6.3 × 10−8 eV cm.

Inspec keywords: organic-inorganic hybrid materials; optical pumping; surface states; photoluminescence; thin films; carrier density; electron-hole recombination; superradiance; energy gap

Other keywords: amplified spontaneous emission; spontaneous emission (ASE) behaviour; band gap renormalization; methylammonium lead iodide perovskite films; ASE threshold carrier density; surface states; ASE threshold pump current

Subjects: Stimulated emission (condensed matter); Thin film growth, structure, and epitaxy; Optical properties of thin films, low-dimensional and nanoscale structures; Electrical properties of thin films, low-dimensional and nanoscale structures; Photoluminescence (condensed matter); Electronic structure of composite materials (thin films, low dimensional and nanoscale structures)

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