Comparison of transport and defects properties in hydrogenated polymorphous and amorphous silicon

Deposition and characterization of polymorphous germanium films prepared by low frequency PECVD

“…These features make them excellent materials for optoelectronic devices, solar cells [1] and thermal detectors [2]. However, amorphous materials have also drawbacks, as a large density of states in the band gap, poor transport properties and poor stability [3].…”

“…The presence of the nanocrystals distributed in the amorphous matrix reduces the density of states, improving the transport properties and stability of the films [3]. Besides the above, polymorphous materials preserve the characteristics of amorphous semiconductors, which are a direct optical band gap and large activation energy (E a ).…”

Study of polymorphous silicon and germanium as thermo-sensing films for infrared detectors

“…The materials studied in this work are amorphous-like and the presence of nanocrystals does not affect significantly the properties of those materials (as E a or E g ), except for the transport properties as the electron mobility and stability [7][8][9][10].…”

“…The nanocrystals in the amorphous matrix reduce the density of states and improve the electric properties and stability of the Journal of Non-Crystalline Solids 358 (2012) 2336-2339 films [7][8][9][10]. In this aspect we believe that polymorphous semiconductors (pm-Si:H and pm-Ge:H) are serious candidates to replace a-Si:H,B as thermo sensing film in commercial microbolometers.…”

Observation of Si nanocrystals in a/nc-Si:H films by spherical-aberration corrected transmission electron microscopy

“…As the majority of the material is amorphous, the quantity of the crystalline material in the film may have some effects on the electrical performance of the material [2,3,6-8, [53][54][55]. The identification of crystallites using displaced-aperture dark-field techniques is possible, as volumes of diffracting material will appear bright [12][13][14][15][16][17]27].…”