Tauira o ngā Pātai Kōrero mō te Ārai-Haumaru
Pendahuluan
Ko te haurua-ira he rauemi kei waenganui i te kawe hiko o te kaiārahi (pērā i te parahi) me te ārai hiko (pērā i te karāhe). I te ao hou, he mea nui te mahi a ngā haurua-ira nā te mea koinei ngā rauemi matua e whakamahia ana hei hanga i ngā momo taputapu hiko, tae atu ki ngā diode, ngā transistors, me ngā ara iahiko whakauru (IC). Ka whakaatuhia e tēnei tuhinga ētahi tauira o ngā raruraru haurua-ira hei āwhina i ngā kaipānui kia mārama ake ki tēnei kaupapa.
1. Hanganga Tioata Ārahi-Haumaru
Pātai: Whakamāramahia te hanganga tioata o ngā haurua-ā-irahiko silicon me te pānga o tēnei hanganga ki ō rātou āhuatanga hiko.
Kōrero: He hanganga tioata tō ngā haurua-whakakotahi silicon e mōhiotia ana ko te tioata tapawhā taimana. I roto i tēnei hanganga, ka honoa ngātahitia ia ngota silicon ki ngā ngota silicon e whā e tata ana, ka hanga he hononga tino pumau. Nā tēnei ka whakamārama he aha te iti o te kawe hiko o te silicon parakore i te pāmahana rūma.
Ka taea te whakanui ake i te kawe hiko o te silicon mā te tāpiri i ngā poke (whakaurunga). Hei tauira, mā te tāpiri i te phosphorus (whakaurunga momo-n) ka puta he irahiko kore utu, ko te tāpiri i te boron (whakaurunga momo-p) ka puta he kōhao hei kawe utu pai.
2. Te Whakaranu i te Ārahi-Haumaru
Pātai: Whakamāramahia te rerekētanga i waenga i te tāpiringa momo-n me te tāpiringa momo-p me ō rāua pānga ki te kawe hiko haurua-ira.
Kōrero: Ko te tāpiri i ngā paru ki tētahi haurua-ā-ira hei whakarerekē i ōna āhuatanga hiko. I roto i te tāpiri i ngā paru momo-n, he nui ake ngā irahiko valence o ngā ngota paru kua tāpirihia i ngā ngota silicon (hei tauira, te whākawa me ngā irahiko valence e 5). Ka huri ēnei irahiko tāpiri hei irahiko kore utu ka taea te whai wāhi ki te kawe hiko, ā, ka piki ake te kawe o te rauemi.
He rerekē, i roto i te whakakī momo-p, he iti ake ngā irahiko valence o ngā ngota poke i te silicon (hei tauira, e toru ngā irahiko valence o te boron). Nā te kore o ngā irahiko valence ka hangaia he kōhao hei kawe utu pai. Ka whakanui ake ēnei kōhao i te kawe hiko mā te tuku i te utu kia neke mā roto i te tioata.
3. Āputa me te Aroturukitanga o te Roopu
Pātai: Whakaahuahia, whakamāramahia hoki te ariā o te āputa roopu me tōna pānga ki te kawe hiko o ngā haurua-ira.
Kōrero: Ko te āputa roopu te pūngao e hiahiatia ana hei neke i ngā irahiko mai i te roopu valence ki te roopu kawe hiko. He iti ake te āputa roopu o ngā haurua-kawe hiko i ngā mea ārai, engari he nui ake i ngā kaikawe hiko.
I roto i ngā haurua-irahiko, ina whiwhi ngā irahiko i te nui o te pūngao (hei tauira, mai i te wera, i ngā photon rānei), ka taea e rātou te peke i te āputa roopu ki te roopu kawe hiko ka huri hei irahiko kore utu ka taea te kawe i te iahiko hiko. Ko te rahi o te āputa roopu e whakatau ana i te ngāwari o te whakaohooho i ngā irahiko ki te roopu kawe hiko:
– He māmā ake te kawe i te iahiko i ngā pāmahana iti iho i ngā haurua-kawe hiko he iti ngā āputa roopu (pērā i te silicon, he ~1.1 eV te āputa roopu).
– Ko ngā haurua-kawe hiko he nui te āputa roopu (pērā i te gallium arsenide, he ~1.4 eV te āputa roopu) me nui ake te pūngao hei kawe hiko, engari ka nui ake te whai huatanga i roto i ētahi whakamahinga pēnei i ngā rama-whakaputa mārama (LED).
4. Tuhinga
Pātai: He aha te transistor, ā, me pēhea tana mahi i roto i ngā tono hikohiko?
Kōrero: Ko te transistor he wāhanga haurua-ira e whakamahia ana hei whakanui, hei whakawhiti rānei i ngā tohu hiko. E rua ngā momo transistor e whakamahia whānuitia ana: ngā transistor hononga bipolar (BJT) me ngā transistor pānga-mara (FET).
I roto i te BJT, e toru ngā paparanga o te momo-p me te momo-n kua whakaritea (npn, pnp rānei). Ko te iahiko e tomo ana ki te turanga (B) e whakahaere ana i te rere o te iahiko i waenga i te kaikohi (C) me te kaituku (E). I roto i te FET, ko te ngaohiko e pā ana ki te kuaha (G) e whakahaere ana i te rere o te iahiko i waenga i te waikeri (D) me te pūtake (S).
Mā ngā transistors ka taea te whakanui i te tohu nā te mea ka taea e ngā panonitanga iti o te tāuru (turanga, kuaha rānei) te whakaputa i ngā panonitanga nui o te putanga (kaikohikohi-kaituku, pūtake-whakaheke rānei). Nā tēnei ka noho ko ngā transistors he wāhanga nui i roto i ngā ara iahiko hiko, tae atu ki ngā whakakaha me ngā ara iahiko arorau.
5. Taioata
Pātai: He aha te mahi a te diode, ā, me pēhea tana mahi?
Kōrero: He wāhanga haurua-ira te diode e taea ai te rere o te iahiko hiko i te kotahi anake te ahunga. He hononga p-n te hanganga o te diode, arā, ko te hononga i waenga i ngā rauemi momo-p me ngā rauemi momo-n. Ina tukuna he ngaohiko ki te ahunga whakamua (anode ki te cathode), ka taea e te iahiko te rere ngāwari. Heoi, ki te tukuna he ngaohiko ki te ahunga whakamuri (cathode ki te anode), ka ārai te ātete teitei i te rere o te iahiko.
Nā tēnei ka tino whai hua ngā diode i roto i ngā mahi pēnei i te whakatikatika (e huri ana i te iahiko whakawhiti ki te iahiko tika), te tiaki ara iahiko, me te whakawhiti tohu.
6. Ngā Whakamahinga o ngā Ārahi-Haumaru i roto i te Hikohiko
Pātai: Whakahuatia ētahi whakamahinga o ngā haurua-ā-ira i roto i ngā hangarau hou, me te whakamārama i ā rātou mahi.
Kōrero: E whakamahia ana ngā haurua-kawe i roto i ngā momo hangarau hou tae atu ki:
– Ngā Pūtukatuka Moroiti me te Mahara: Mā te whakamahinga o ngā transistors i roto i ngā ara iahiko whakauru (IC) ka taea te hanga i ngā tukatuka moroiti me ngā maramara mahara tino uaua, tino whai hua hoki.
– Ngā Pūoko: Ka taea e ngā pūoko hiko-haurua te kite i ngā tawhā ā-tinana pērā i te mārama (ngā photodiode), te pāmahana (ngā thermistors), me te pēhanga (ngā pūoko piezoelectric).
– Ngā Pūhiko Whakaputa Marama (LED): Ka taea e ētahi haurua-ā-ira te tuku mārama ina rere te iahiko mā roto i a rātou, e whakamahia ana i roto i ngā whakaaturanga, rama, me ngā tohu.
– Ngā Pūtau Rā: Ka hangaia he iahiko hiko e ngā mea hiko-ā-ira pērā i te silicon ina pāngia e te rā, ka whakamahia i roto i ngā panera rā hei whakaputa pūngao hiko.
Te Katinga
Mā te mārama ki ngā ariā taketake o ngā haurua-waenga me ngā tauira raruraru kua kōrerohia ka āwhina i ngā kaipānui ki te mōhio ki te kaupapa me ngā whakamahinga o ngā haurua-waenga i roto i te hangarau hou. E tumanakohia ana mā tēnei tuhinga e whakarato he tirohanga hōhonu ki ngā mahi, ngā mātāpono mahi, me te hiranga o ngā haurua-waenga i roto i te ao hikohiko.
