L’objectif de ce travail de thèse est d’étudier certaines propriétés locales de structures contenant des nanocristaux de Ge sur leur surface par utilisation de la technique nano-EBIC(courant induit par bombardement électronique et collecté par un nano-contact). La particularité de cette technique qui utilise le même principe que la technique EBIC classique est l’utilisation d’une pointe conductrice d’un AFM (microscope à force atomique) à la place d’une électrode standard. Nous nous sommes intéressés à la détermination de la longueur de diffusion effective (Leff) et l’étude de sa variation en fonction de paramètres tels que l’énergie primaire et la taille des nanocristaux. Leff augmente pour les faibles énergies primaires, passe par un maximum qui dépend de la taille des nanocristaux, puis diminue pour les énergies élevées. Ce comportement de l’évolution de Leff a été expliqué en chapitre 2. Cependant, ce résultat n’a jamais été observé auparavant. C’est pourquoi, nous avons complété ce travail par une étude basée sur la simulation Monte-Carlo, où l’effet de plusieurs paramètres a été analysé. Parmi les paramètres étudiés, on cite la taille et la forme du nano-contact (ou plus précisément la taille de la nano-zone de déplétion qui se forme sous le contact), la vitesse de recombinaison en surface et l’énergie primaire. La simulation donne le même comportement de variation de Leff que dans le cas expérimental. / The objective of this work is to study certain local properties of structures containing on their surface Ge nanocrystals by using the nano-EBIC (Electron beam induced current collected by a nano-contact). The peculiarity of this technique which uses the same principle as the classical EBIC technique is the use of a conductive AFM (atomic force microscope) tip instead of a standard electrode. We were interested in the determination of the effective diffusion length (Leff) and the study of its variation according to parameters such as the primary energy and the size of nanocrystals. Leff increases for weak energies, reaches a maximum which depends on the nanocrystal size, then decreases for high energies. This behavior of the evolution of Leff was explained in chapter 2. However, this result has never been reported previously. That is why we completed this work by a study based on the Monte-Carlo simulation, where the effect of several parameters was analyzed. Among the parameters studied, we quote the size and the shape of the nano-contact (or more exactly the size of the depletion nano-zone formed under the contact), the surface recombination velocity and the primary energy. The simulation gives the same behavior of Leff variation than the experimental case.

Lee Ming-kwan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1973. / Includes bibliographical references (leaves 82-89). / Methodological Preface --- p.iv / Introduction --- p.1 / Chapter Chapter I --- INNOVATION DIFFUSION: THE CHINESE THEORY --- p.7 / Introduction / Agro-technical Revolution: The Actualization Of An Objective Historical Necessity / Agro-technical Innovations Precipitate Con-tradictions Among The People / Innovativeness / The Comoplementary Of The Processes Of Inno-vation And Diffusion / Chapter Chapter II --- THE NATURE OF INNOVATIONS. --- p.17 / Introduction / A Heuristic Model Of Innovation Attributes / The Attributes Of Agro-technical Innovations In Communist China / Chapter Chapter III --- PLANNED DIFFUSION: TOWARDS A CHINESE MODEL OF INNOVATION DIFFUSION --- p.36 / Introduction / Toward A Taxonomy Of Planned Diffusion / Conflict As Strategy--Emulation Campaign / "Conflict As Strategy--""Struggle""" / Chapter Chapter IV --- THE CADRE AS CHANGE AGENT --- p.64 / Introduction / The Milieu Of Change Agentry / Change Agentry-The Chinese Style / Chapter Chapter V --- CONCLUSION --- p.80 / NOTES --- p.82

From 1983 in which year Chinese people started being allowed to travel to the first outbound destination to nowadays that more than 150 countries have signed the ADS (approved destination status) with Chinese government, Chinese outbound tourism had a great progress in 32 years. During these years, more and more Chinese tourists could be seen in different places in the world. In 2014, the number of Chinese outbound tourists firstly achieve to over 100 million. The numbers are predicted to continue by 2020. It is meaningful to put Chinese outbound tourism as an object and discover its future development. Therefore, the aim of this study is set as to analyse the future diffusion of Chinese outbound tourism. The available theoretical foundation is diffusion theory (Rogers, 2003). Its mature and practical theoretical system guides the research framework of this study. This theory is reliable for analysing and discussing the diffusion of Chinese outbound tourism from some aspects such as S-shaped curve, communication channels, adopter classification, etc.  A questionnaire survey and some hypothetical indicators are designed in this study to fulfil the aim and research questions. Results are described from several aspects. The analysis of results prove that Chinese outbound tourism could be reckoned as an innovation. Finally, conclusions show that Chinese outbound tourism is currently going through the developing process between ‘innovators’ and ‘early adopters’. If the influencing factors which derived based on diffusion theory could be developed or solved positively, it is possible for Chinese outbound tourism to develop continually following the S-shaped curve in the future. The influencing factors has been studied out. They are the communication channels, the conscious gap between people who live in cities and people who live in towns and villages, the wealth gap between rich people and poor people. Not many related implementations are given out in this study, which needs future researches to explore.

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