Optical investigations of PbI2 single crystals after thermal treatment

Abstract

Jew data are reported concerning the luminescence of PbI, single crystals submitted to thermal treatments. Both the analysis of this luminescence by time-resolved spectroscopy and its dependence on the thermal treatment and the perfection of the lattice indicate the existence of complex luminescent centres. By extending the photoconduction and absorption studies into the near IR, supplementary dat,a are obtained concerning the levels induced in the energy band gap due to the centres creat,ed by t'hermal treatment and irradiation.On prksente des donnees nouvelles concernant la luminescence des monocristaux de PbI, soumis aux traitements thermiques. L'analyse de cette luminescence par spectroscopie A resolution temporelle e t sa dbpendence de la temperature de traitement thermique e t de la perfection du rBseau cristallin indiquent l'existence des centres complexes de luminescence. On prksente aiissi les r6sultat.s des Btudes de photocondwtion e t d'absorption dans le prouhe IR concernant les nouveaiix niveaux d'hnergie dans la bande interdite dtis aux centres crbbs par le traitement thermique et, l'irradiation.

A review of polytypism in lead iodide

“…It is a candidate for use in image recording [6]. It has potential applications such as roomtemperature photocells, X-ray detectors, and low-energy gamma ray detectors [7].…”

“…As a semiconductor, trapping centers (vacancies), impurities [13], and intercalated molecules [4,5] can be inserted between the I-Pb-I sandwiches in a controlled manner to induce energy levels in the pure material band gap and thus control the effective band gap which is in the ideal range of 1-3 eV [6]. Very thorough band structure calculations have been made [14] and phonon dispersion calculations have been presented [7,15].…”

“…It seems reasonable that this has very important consequences for semiconductor properties. The results of any experimental technique that measures "hopping" motions like nuclear magnetic resonance relaxation [41] and luminescence studies [6] will depend greatly on not only the overall density of vacancies, but their distribution. It seems logical that this could result in a wide distribution of local structures.…”

Lead Iodide X-Ray and Gamma-Ray Spectrometers for Room and High Temperature Operation

“…The room 2 1 temperature drift mobilities of electrons and holes have also been reported to be 8 and 2 cm V s-*, respectively [5]. The v&ous poiytypic phases of lead iodide have been extensively studied[3] [6] [7] and it has been established that high purity lead iodide is all of one polytype (2H) [6][8] with a melting point of 408 OC. It should be noted that the'lack of any solid-solid phase transitions in lead iodide clearly distinguishes it from the related material mercuric iodide and allows it to be grown from the melt.…”

Correction: A review of polytypism in lead iodide

“…PbI 2 is used to study cluster formation [1,2] and to study thin films of various molecules that can be placed between the layers (intercalation) [3][4][5]. It is a candidate for use in image recording [6]. It has potential applications such as room-temperature photocells, X-ray detectors, and low-energy gamma ray detectors [7].…”