Asayansi ochokera ku MIT adziwitsa silicon yomwe ilipo dzuwa ma cell ndi singlet exciton fission njira. Izi zikhoza kuonjezera dzuwa la dzuwa Maselo amachokera pa 18 peresenti kufika pa 35 peresenti motero amachulukitsa mphamvu zotulutsa mphamvu kuwirikiza kawiri motero kuchepetsa mtengo wa umisiri wa dzuwa.
Ndikofunikira kuti tichepetse kudalira kwathu mafuta oyambira pansi ndikumanga matekinoloje kuti tikhale ndi tsogolo lokhazikika. Mphamvu ya dzuwa ndi gwero zongowonjezwdwa za mphamvu kumene A Sun kuwala kumasinthidwa kukhala mphamvu yamagetsi. Ma cell a solar Nthawi zambiri amapangidwa ndi silicon yomwe imagwiritsa ntchito njira ya photovoltaic kusintha dzuwa mu magetsi. Ma cell a tandem akupangidwanso omwe nthawi zambiri amaphatikiza ma cell a perovskites pomwe gawo lililonse la ma cell dzuwa ma cell amatha kugwira ntchito A Sun mphamvu zochokera kumitundu yosiyanasiyana ndipo motero zimakhala ndi mphamvu zambiri. Maselo a dzuwa omwe alipo masiku ano ndi ochepa chifukwa cha mphamvu zawo zomwe ndi 15-22 peresenti yokha.
Kafukufuku wofalitsidwa pa Julayi 3 mu Nature wasonyeza mmene silicon dzuwa mphamvu zama cell zitha kukwezedwa mpaka 35 peresenti pogwiritsa ntchito zomwe zimatchedwa singlet exciton fission. Pachifukwa ichi kagawo kakang'ono ka kuwala (photon) kungathe kupanga mawiri awiri a electron-hole kusiyana ndi imodzi yokha. Single exciton fission ikuwoneka muzinthu zambiri kuyambira pomwe idapezeka mu 1970s. Kafukufuku wapano adafuna kumasulira izi kwa nthawi yoyamba kukhala yotheka dzuwa selo.
Ofufuza adasamutsa exciton fission effect imodzi kuchokera ku tetracene - chinthu chodziwika chomwe chimawonetsera - kukhala crystalline silicon. Tetracene iyi ndi hydrocarbon organic semiconductor. Kusinthaku kudatheka poyika gawo lowonjezera la hafnium oxynitride (8 angstrom) pakati pa excitonic tetracene wosanjikiza ndi silicon. dzuwa cell ndi kugwirizana iwo.
Chosanjikiza chaching'ono ichi cha hafnium oxynitride chidakhala ngati mlatho ndikupangitsa kuti pakhale mafotoni amphamvu kwambiri mumtundu wa tetracene womwe udayambitsa kutulutsidwa kwa ma elekitironi awiri mu cell ya silicon mosiyana ndi momwe zimakhalira. Kulimbikitsa kwa silicon uku dzuwa cell inachepetsa kuwonongeka kwa thermalization ndikupangitsa kumva bwino pakuwala. Mphamvu linanena bungwe la dzuwa ma cell amachulukira kawiri pomwe zotulutsa zambiri zidapangidwa kuchokera kumadera obiriwira ndi abuluu a sipekitiramu. Izi zitha kukulitsa luso la dzuwa ma cell mpaka 35 peresenti. Ukadaulo umasiyana ndi ma tandem solar cell popeza umangowonjezera zamakono ku silicon popanda kuwonjezera ma cell ena.
Kafukufuku waposachedwa wawonetsa ma cell a solar a singlet-fission a silicon omwe amatha kuwonetsa mphamvu zochulukirapo motero amachepetsa mtengo wonse wopangira mphamvu zamagetsi zamagetsi.
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Kasupe (s)
Einzinger, M. et al. 2019. Kulimbikitsa kwa silicon ndi singlet exciton fission mu tetracene. Chilengedwe. 571. https://doi.org/10.1038/s41586-019-1339-4
