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2. HeterojunctionÀÇ Æ¯¼º

3. Heterojunction ¹ÝµµÃ¼½ÖÀÇ ¼±ÅÃ

4. ´Ü°áÁ¤Ãþ ¼ºÀå¹ý(Epitaxy)

1. Metal-Organic Vapor Phase Epitzxy (MOVPE)
2. ±âº»°øÁ¤ ¹× ÀåÄ¡
3. MOVPE ¹ÝÀÀ
4. MOVPE ¹ÝÀÀÀÇ Æ¯Â¡

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2. HeterojunctionÀÇ Æ¯¼º
Bandgap energy°¡ ´Ù¸¥ ¹ÝµµÃ¼¸¦ ¼­·Î Á¢ÇÕ½Ã۸é À̵éÀÇ energy band±¸Á¶¿¡ µû¶ó ƯÀ¯ÀÇ conduction band ¹× valence bandÀÇ ¹êµå¹è¿­(line-up)ÀÌ Çü¼ºµÈ´Ù. ¼ÒÀÚÀÇ ±â´ÉÀ» ¹ßÈÖÇÏ´Â µ¥¿¡ ¸¹ÀÌ »ç¿ëµÇ´Â ´ëÇ¥ÀûÀÎ ¹êµå¹è¿­À» ±×¸² 1¿¡ µµ½ÃÇÏ¿´´Ù. Bandgap energy°¡ ÀÛÀº ¹ÝµµÃ¼¸¦ A, Å« ¹ÝµµÃ¼¸¦ B¶ó°í Ç¥½ÃÇÑ´Ù.
±×¸² 1(a)¿Í °°Àº heterojunctionÀÇ °æ¿ì B¿¡ ÀÖ´Â ÀüÀÚµéÀº energy°¡ ³·Àº A·Î À̵¿ÇϰíÀÚ ÇÑ´Ù. ÀüÀÚµéÀÌ À̵¿Çϸé A¿¡´Â ¾çÀü±â¸¦ ¶í, °ÝÀÚ¿¡ °íÁ¤µÇ¾î ÀÖ´Â ¿øÀÚµéÀ» ³²±â°Ô µÇ¹Ç·Î A·Î À̵¿ÇÏ´Â ÀüÀÚÀÇ ¼ö´Â ¾çÀü±â¸¦ ¶í ¿øÀÚ¿Í À̵é ÀüÀÚ¿ÍÀÇ Àü±âÀû(electrostatic)±ÕÇü¿¡ ÀÇÇØ °áÁ¤µÈ´Ù. A·Î À̵¿ÇÑ ÀüÀÚµéÀº A¿Í B¿ÍÀÇ °è¸é(interface)¿¡ ³õ¿©ÀÖ°Ô µÇ°í µû¶ó¼­ AÀÇ conduction band energy¸¦ ³·Ãß°Ô µÈ´Ù. ÀÌ °á°ú AÀÇ conduction band¿¡´Â semi-triangular potential wellÀÌ Çü¼ºµÇ°í °è¸é°ú ¼öÁ÷ÇÑ ¹æÇâÀ¸·ÎÀÇ ÀüÀÚÀÇ ¿òÁ÷ÀÓÀº ¾çÀÚÈ­(quantized)µÈ´Ù. ÀÌ·¯ÇÑ potential well¿¡ ÀÖ´Â ÀüÀÚ¸¦ ÀÌÂ÷¿øÀû ÀüÀÚ°¡½º (2-dimensional electron gas, 2-DEG)¶ó°í ÇÑ´Ù. ÀÌ ±¸Á¶´Â MODFET(ȤÀº High Electron Mobility Transisto¡¦(»ý·«)
Âü°í¹®Çå

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