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Footnotes i. There are other differences, such as that free electrons can move roughly twice as fast as holes. Nevertheless, because of the complexity that would be involved in studying such aspects, we choose not to deal with them at the SE level. ii. This is a simplification to represent the collective electrical contribution of the electrons of the valence band which is almost full. iii. In general, by doping semiconductors the designers of electronic devices are able to control electrical conduction in these materials, and thus achieve new and better electronic applications. In this introduction to extrinsic semiconductors at the SE level, however, we think that it is sufficient for the students to understand that doping allows one to obtain a semiconductor that conducts electricity well at room temperature, which is not the case in an intrinsic semiconductor. iv. In practice, n-type semiconductors are more interesting since their majority charge carriers are free electrons which have a greater mobility than holes [the majority charge carriers in p-type semiconductors]. Nonetheless, we do not deal with this in our teaching sequence since the explanation would be complicated for SE students. References Ainley, D. (1984). Some strategies for teaching electronics to less able pupils. The School Science Review, 66, 31-38. Ayensa, J.M. (2001). "Instrumentos de regulación y modelo de evaluación en el aula de Física". PhD Thesis. Madrid, Universidad Nacional de Educación a Distancia (UNED). Barak, M. (2002). Learning good electronics or coping with challenging tasks: the priorities of excellent students. Journal of Technology Education, 14(1), 20-34. Bevis, G., Gough, C. & Deeson, E. (1985). Ban Electronics from school physics! Physics Education, 20, 109-110. Butterfield, M. (2004). Electronics: Present Knowledge, Future Trends. USA, Apple Media. Corati, R., Mulaj, Z. & Corati, K. (1995). A new approach to the teaching of semiconductors in the secondary schools of Albania. In International Conference Teaching the Science of Condensed Matter and New Materials (pp. 24-30). Italy. Criado, A.M. & Cañal, P. (2003). Investigación de algunos indicadores del estatus cognitivo de las concepciones sobre el estado eléctrico. Enseñanza de las Ciencias, núm. extra, 29-41. Elliott, J. (2000). La investigación-acción en educación (4th ed.). Madrid, Morata. Download 479.93 Kb. Do'stlaringiz bilan baham: |
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