Ghosh Pameli, Medda Anusri, Ghosh Soubhik, Patra Amitava
School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, 700032, Kolkata, India.
Institute of Nano Science and Technology, Knowledge City, Sector 81, Mohali, 140306, India.
Chemphyschem. 2024 Oct 16;25(20):e202400267. doi: 10.1002/cphc.202400267. Epub 2024 Aug 5.
Colloidal two-dimensional (2D) nanoplatelets (NPLs) have been extensively studied owing to promising potential in optoelectronic applications. Here, we have reported the preparation of 2D CdSeTe alloy NPLs and investigated their energy and charge transfer with porphyrin molecules. The red shifting in the optical properties suggests the change in the band gaps. Furthermore, the energy and the charge transfer are evident in the composite of CdSeTe alloy NPLs with 5,10,15,20-tetra(4pyridyl)-porphyrin (TpyP) molecules. The quenching in the photoluminescence (PL) spectra and PL decay time supports the energy transfer (~61 % efficiency) and the charge transfer. The thermodynamically feasible hole transfer is evidenced by the band alignment of the alloy NPLs and TpyP molecules, which is further supported by a transient absorption spectroscopy (TAS) study. The TA study found the hole transfer within ~3 ps time scale, proving the effective charge carrier separation for better optoelectronic applications.
胶体二维（2D）纳米片（NPLs）因其在光电子应用中的潜在前景而受到广泛研究。在此，我们报道了二维CdSeTe合金纳米片的制备，并研究了它们与卟啉分子之间的能量和电荷转移。光学性质的红移表明带隙发生了变化。此外，CdSeTe合金纳米片与5,10,15,20-四（4-吡啶基）-卟啉（TpyP）分子的复合材料中能量和电荷转移明显。光致发光（PL）光谱和PL衰减时间的猝灭支持了能量转移（效率约为61%）和电荷转移。合金纳米片与TpyP分子的能带排列证明了热力学上可行的空穴转移，瞬态吸收光谱（TAS）研究进一步支持了这一点。TAS研究发现空穴转移发生在约3 ps的时间尺度内，证明了有效的电荷载流子分离，有利于更好的光电子应用。
