Mn-Doped Organic–Inorganic Perovskite Nanocrystals for a Flexible Luminescent Solar Concentrator

Abstract

We report a robust method of hot addition (HAM) to prepare methylammonium lead trichloride (MAPbCl3) and Mn-doped MAPbCl3 (Mn:MAPbCl3) perovskite nanocrystals (PeNCs) for application in luminescent solar concentrators (LSCs). The HAM, which is free of solvent and operates at high temperatures, is applicable to the synthesis of highly crystalline and stable organic–inorganic PeNCs with tunable optical properties. The Mn:MAPbCl3 PeNCs showed a remarkable energy-transfer shift from 400 to 600 nm that enhanced the optical efficiency when these PeNCs were incorporated in an LSC with a silicon solar-cell module. An optical efficiency (OE) greater than 8% was achieved on incorporation of only 0.094 mass % Mn:MAPbCl3 PeNCs in the LSC. A Monte-Carlo ray-tracing simulation was developed to improve the understanding of the experimental results and estimate the ultimate device performance for future application in building-integrated photovoltaic devices.

Retarded Charge Recombination to Enhance Photocatalytic Performance for Water-Free CO2 Reduction Using Perovskite Nanocrystals as Photocatalysts

“…17 In the present study, we developed a noncubic PeNC by incorporating FA cation into the reference CS PeNC nanocrystal to form a cocationic PeNC, Cs 1−x FA x PbBr 3 (CF, x = 0.45 determined by SEM/EDX data), synthesized using the hot addition method (HAM) developed by ourself. 19,20 We found that the CO product yield of photocatalytic CO 2 reduction using CF as a catalyst is three times greater than that using CS as a catalyst in the absence of water. 21 In situ femtosecond transient absorption spectral (TAS) studies for both CS and CF samples were carried out to understand the relaxation dynamics of photoinduced charge carriers for both catalysts in their pristine forms, in an N 2 environment irradiated for 12 h, and in an environment adsorbed with CO 2 irradiated for 12 h. We found that the TAS transients of photobleach (PB) bands show charge recombination in two time scales; the rapid decay corresponds to the shallow surface trap state relaxation while the slow decay corresponds to the bulk trap state relaxation.…”

“…In the present study, we developed a noncubic PeNC by incorporating FA cation into the reference CS PeNC nanocrystal to form a cocationic PeNC, Cs 1– x FA x PbBr 3 (CF, x = 0.45 determined by SEM/EDX data), synthesized using the hot addition method (HAM) developed by ourself. , We found that the CO product yield of photocatalytic CO 2 reduction using CF as a catalyst is three times greater than that using CS as a catalyst in the absence of water …”

“…The CF PeNC was synthesized via the HAM by adding FABr/IPA solution to the reaction mixture prior to injection of Cs–oleate as reported elsewhere. , The CS PeNC was synthesized using the traditional hot-injection method to compare with the HAM-synthesized CF. Figure S1 shows that both PeNCs are cubic and highly crystalline with average nanocrystal size of ∼8 nm.…”

Interface-Enhanced Charge Recombination in the Heterojunction between Perovskite Nanocrystals and BiOI Nanosheets Serves as an S-Scheme Photocatalyst for CO2 Reduction

“…For this purpose, we designed an Sheterojunction system with a co-cationic cesium formamidinium lead halide perovskite (Cs A relaxation mechanism is proposed to interpret the CO production yields appropriately for CO 2 reduction with pristine and PHJ samples as photocatalysts. Cs 1−x FA x PbBr 3 perovskite nanocrystals were synthesized by the method of hot addition; 22,23 ultrathin BiOI nanosheets were synthesized from rubidium bismuth iodide 24 (Rb 3 Bi 2 I 9 ) PeNC on washing rubidium (Rb) and oxidizing BiI 6 octahedra of Rb PeNC with isopropyl alcohol (IPA) and water. 21 Stirring CF and BiOI powders together for 48 h in toluene produced the CF:BiOI heterojunction samples.…”

“…Cs 1– x FA x PbBr 3 perovskite nanocrystals were synthesized by the method of hot addition; , ultrathin BiOI nanosheets were synthesized from rubidium bismuth iodide (Rb 3 Bi 2 I 9 ) PeNC on washing rubidium (Rb) and oxidizing BiI 6 octahedra of Rb PeNC with isopropyl alcohol (IPA) and water . Stirring CF and BiOI powders together for 48 h in toluene produced the CF:BiOI heterojunction samples.…”