I kitea e Te Whare Wānanga o Peking he perovskite tonupūtake laseriti iho i te 1 maikorona tapawhā
He mea nui kia hangaia he pūtake taiaho tonu me te horahanga o te taputapu iti iho i te 1μm2 hei whakatutuki i te hiahia iti o te whakapaunga pūngao mō te hononga whatu i runga i te maramara (<10 fJ bit-1). Heoi, i te hekenga o te rahi o te taputapu, ka nui haere ngā ngaronga whatu me ngā rauemi, nō reira he tino uaua te whakatutuki i te rahi o te taputapu iti-micron me te pupuhi whatu tonu o ngā pūtake taiaho. I ngā tau tata nei, kua aro nuihia ngā rauemi perovskite halide i roto i te mara o ngā taiaho pupuhi whatu tonu nā te mea he nui te whakanui whatu me ngā āhuatanga motuhake o te exciton polariton. Ko te horahanga o te taputapu o ngā pūtake taiaho perovskite tonu kua pūrongohia tae noa ki tēnei wā he nui ake i te 10μm2, ā, me whai mārama pupuhi me te kiato pūngao papu teitei ake ngā pūtake taiaho iti-micron hei whakaoho.
Hei whakautu i tēnei wero, i angitu te rōpū rangahau a Zhang Qing o te Kura Pūtaiao Rauemi me te Hangarau o Te Whare Wānanga o Peking ki te whakarite i ngā rauemi karaihe kotahi perovskite submicron kounga teitei hei whakatutuki i ngā pūtake taiaho papu whatu tonu me te horahanga taputapu he iti iho i te 0.65μm2. I taua wā anō, ka whakakitea te photon. Kua mārama hohonu te tikanga o te exciton polariton i roto i te tukanga whakamahana whatu tonu submicron, e whakarato ana i tētahi whakaaro hou mō te whanaketanga o ngā taiaho semiconductor paepae iti. Ko ngā hua o te rangahau, ko "Continuous Wave Pumped Perovskite Lasers with Device Area Below 1 μm2," i whakaputaina i roto i te Advanced Materials.
I roto i tēnei mahi, i whakaritea te pepa micron tioata kotahi perovskite CsPbBr3 inorganic ki runga i te papa sapphire mā te whakatakotoranga kohu matū. I kitea ko te hononga kaha o ngā excitons perovskite me ngā photons microcavity pakitara oro i te pāmahana rūma i hua ake ai te hanganga o te polariton excitonic. Mā roto i te raupapa o ngā taunakitanga, pērā i te kaha tukunga raina ki te kore-raina, te whānui rārangi whaiti, te huringa polarization tukunga me te huringa ōrite ā-wāhi i te paepae, kua whakaūhia te fluorescence paura whatu tonu o te tioata kotahi CsPbBr3 iti-micron te rahi, ā, ko te horahanga o te taputapu he iti ki te 0.65μm2. I taua wā anō, i kitea ko te paepae o te pūtake taiaho iti-micron he rite ki te pūtake taiaho nui, ā, ka taea te iti ake (Pikitia 1).
Pikitia 1. He submicron CsPbBr3 e pupuhihia ana e te whatu tonupūtake mārama taiaho
Hei tāpiri atu, ka tūhuratia e tēnei mahi ngā mahi whakamātautau me ngā mahi ariā, ā, ka whakakitea te tikanga o ngā exciton porowhita-exciton i roto i te whakatinanatanga o ngā pūtake taiaho submicron tonu. Ko te hononga photon-exciton whakarei ake i roto i ngā perovskites submicron ka hua ake he pikinga nui o te taupū whakaata rōpū ki te 80 pea, ka nui ake te whakanui i te whakanui aratau hei utu mō te ngaronga aratau. Ka hua ake hoki tēnei i tētahi pūtake taiaho submicron perovskite me te tauwehe kounga microcavity whai hua teitei ake me te whānuitanga raina tuku whaiti ake (Pikitia 2). Ka whakaratohia hoki e te tikanga he māramatanga hou ki te whanaketanga o ngā taiaho iti-rahi, iti-paepae i runga i ētahi atu rauemi semiconductor.
Pikitia 2. Te tikanga o te pūtake taiaho iti-micron mā te whakamahi i ngā polarizon excitonic
Ko Song Jiepeng, he tauira Zhibo o te tau 2020 nō te Kura Pūtaiao Rauemi me te Hangarau o Te Whare Wānanga o Peking, te kaituhi tuatahi o te pepa, ā, ko Te Whare Wānanga o Peking te wāhanga tuatahi o te pepa. Ko Zhang Qing rāua ko Xiong Qihua, he ahorangi Ahupūngao i Te Whare Wānanga o Tsinghua, ngā kaituhi e pā ana. I tautokona te mahi e te National Natural Science Foundation of China me te Beijing Science Foundation for Outstanding Youth People.
Wā tuku: Hepetema-12-2023