Abstract
Perovskites have recently attracted intense interests for optoelectronic devices application due to their excellent photovoltaic and photoelectric properties. The performance of perovskite-based devices highly depends on the perovskite material properties. However, the widely used spin-coating method can only prepare polycrystalline perovskite and physical vapor deposition (PVD) method requires a higher melting point (>350 °C) substrate due to the high growth temperature, which is not suitable for low melting point substrates, especially for flexible substrates. Here, we present the controlled synthesis of high quality two-dimensional (2D) perovskite platelets on random substrates, including SiO2/Si, Si, mica, glass and flexible polydimethylsiloxane (PDMS) substrates, and our method is applicable to any substrate as long as its melting point is higher than 100 °C. We found that the photoluminescence (PL) characteristics of perovskite depend strongly on the platelets thickness, namely, thicker perovskite platelet has higher PL wavelength and stronger intensity, and thinner perovskite exhibits opposite results. Moreover, photodetectors based on the as-produced perovskite platelets show excellent photoelectric performance with a high photoresponsivity of 8.3 A·W−1, a high on/off ratio of ~103, and a small rise and decay time of 30 and 50 ms, respectively. Our approach in this work provides a feasible way for making 2D perovskite platelets for wide optoelectronic applications.
Highlights
Organic-inorganic halide perovskite are materials described by AMX3 formula, in which A is organic cation, M is metal cation and X is halogen anion [1]
Chemical vapor deposition (CVD) is promising for the synthesis of high quality perovskite with well-defined structures and morphologies [27,28], especially for two-dimensional (2D) CH3NH3PbI3 perovskite platelets. This method involves two steps: firstly, PbI2 platelets were grown on mica substrate under 350–510 ◦C, and the as-grown PbI2 platelets were converted to CH3NH3PbI3 perovskites through inserting the CH3NH3I molecules into the PbI2 platelets under 120 ◦C [29]
We can observe that the surfaces of all the 2D PbI2 platelets are smooth and uniform, no matter the substrate is rigid (Si, mica and glass)/flexible (PDMS) or smooth (Si and mica)/rough (PDMS and glass), which indicates that the toughness and roughness of the substrates do not play a key role during the PbI2 single crystal growth process
Summary
Organic-inorganic halide perovskite are materials described by AMX3 formula, in which A is organic cation, M is metal cation and X is halogen anion [1]. Among the variety kinds of perovskites, methylammonium lead iodide perovskite (CH3NH3PbI3) has attracted intensive interest due to its extraordinary optoelectronic properties such as long electron/hole diffusion lengths, high optical absorption coefficient, and optimal bandgap [11,12]. These advantages have generated widely growing interest for diverse applications such as photodetectors [13,14,15,16], light-emitting diodes (LEDs) [17,18,19,20,21], waveguides [22], field effect transistors (FET) [23], lasers [24,25], etc. The need for developing other alternative routes to produce high quality perovskite platelets without lead halide vapour during the process on diverse substrates, especially on flexible substrates remains a challenge
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