Relaxed excitons in Cu2O

Photoluminescence and X-ray diffraction studies on Cu2O

“…The region of relaxed excitons at oxygen and copper vacancies extend from 630 to 1200 nm [29]. The direct band gap recombination transitions can be observed only at very low temperatures ($2 K) in high-quality material from 600 to 630 nm [28]. The 10 K PL spectra in Fig.…”

“…The Fig. 4 shows the 10 K PL spectrum of a Cu 2 O sample crystallized by 192 h. The PL in Cu 2 O has been extensively studied for a long time [13,28,29]. Two main groups of PL signals have been identified; the free excitons and bound excitonic region extend from 450 to 650 nm.…”

“…5 shows the PL response for a sample crystallized during 96 h. The measurements were done from 30 to 180 K because in this temperature range the most noticeable changes on the PL signal are detected [28][29][30]. The observed PL signals corresponds to the next transitions: The band at 720 nm is due to the recombination of excitons bound to double charged oxygen [28][29][30].…”

Preparation and Optoelectronic Characteristics of ZnO/CuO-Cu2O Complex Inverse Heterostructure with GaP Buffer for Solar Cell Applications

“…The spectra of the COC layers include four peaks, i.e. , A at 2.11 eV, B at 2.15 eV, C at 2.44 eV, and D at 2.46 eV [23]. Peaks A and B are associated with the free exiton and band-to-band transition of Cu 2 O layers, respectively.…”

Preparation of Cu 2O nanoparticles dispersed in NH 2-terminated polyethyleneoxide matrix

“…Cu 2 O is known as p-type semiconductor and exhibit characteristic exciton absorption at low temperature [8][9][10]. Although characteristics of Cu 2 O films have been studied in detail [11][12][13][14][15], there are few studies related to preparation of copper (I) oxide nanoparticles [16,17]. For the characterization of the composite films, transmission electron microscope (TEM), thermogravimetrydifferential thermal analysis (TG-DTA), and Fouriertransform infrared (FT-IR) spectroscopy were used.…”