Stable copper‐based 2D perovskite (NH₃C₃H₆NH₃)CuBr₄ thin film processed from green solvent for thermoelectric application

Abstract

Great achievements about lead‐based halide perovskites have been made in the fields of photovoltaic solar cells, light emitting diodes, photodetectors, and thermoelectric devices. However, the toxicity and instability of lead‐based materials hinder their practical application. Herein, we used propane‐1,3‐diammonium cation to construct a copper‐based halide perovskite material (NH3C3H6NH3)CuBr4 with a two‐dimensional layered structure. This material exhibits a suitable bandgap of 1.71 eV for a broad‐band absorption. Dense and flexible (NH3C3H6NH3)CuBr4 thin film can be obtained by simple spin‐coating of the solution using green solvent DMSO. Furthermore, (NH3C3H6NH3)CuBr4 shows excellent stability towards temperature, humidity and UV‐light. Finally, the (NH3C3H6NH3)CuBr4 thin film shows a reasonable Seebeck coefficient of −13.8 μV K−1 and a power factor of 1.70 μW m−1 K−2 at 298 K, demonstrating the great potential for flexible n‐type thermoelectric application.

Structural Elucidation of Electrical and Optical Properties in Lead‐free Organic‐Inorganic Copper Bromide [(CH3)4N]2CuBr4 Single Crystals

“…Organic-inorganic metal halides (OIMHs) are a new and exciting field of study with potential applications in energy and next-generation electronics. OIMHs have become one of the most extensively studied materials for photodetectors, [15] electrocaloric, [16] energy storage, and device applications such as solar cell applications, [17] and light-emitting diode applications. [18][19][20][21] The researchers show great interest in OIMHs due to their low production cost, ease of processing, and biocompatibility.…”

Tunable Optical Properties of Two-Dimensional Copper-Based Halide Perovskites with Mixed Organic Cations

“…9 Lead-halide perovskites have been intensely investigated, but their toxicity limits their practical applications. 10,11 Lead-free perovskites with tailored photophysics are appealing. 12 Copper-based perovskites are promising candidates because of their merits (e.g., low cost, high optical absorption coefficients, 13 and environment friendliness).…”

Crystal structure and electronic properties of low-dimensional hexamethylenediaminium lead halide perovskites

“…12 The properties of hybrid 2D perovskites with various organic cations were studied earlier. [13][14][15][16][17][18][19][20][21] Perovskite crystal and electronic structures are closely related. According to earlier reports, in some hybrid perovskites bandgaps decrease as the angles Pb-X-Pb between neighboring PbX 6 octahedra increase.…”