Ososayensi abavela ku-MIT baqwashise i-silicon ekhona i-solar amaseli ngendlela ye-singlett exciton fission. Lokhu kungandisa ukusebenza kahle kwe i-solar amangqamuzana asuka kumaphesenti angu-18 aye phezulu angamaphesenti angu-35 ngaleyo ndlela aphinda kabili amandla okukhipha amandla ngaleyo ndlela ehlise izindleko zobuchwepheshe belanga.
Sekuyabaluleka ukwehlisa ukuncika kwethu emafutheni ezinto ezimbiwa phansi futhi sakhe ubuchwepheshe bekusasa elisimeme. Amandla elanga iwumthombo ovuselelekayo we amandla lapho OkwaLanga ukukhanya kuguqulwa kube amandla kagesi. Amaseli elanga ngokuvamile zenziwe nge-silicon esebenzisa inqubo ye-photovoltaic ukuguqula ilanga kugesi. Amaseli e-Tandem nawo ayaklanywa ahlanganisa amaseli e-perovskites lapho zonke izingxenye ze- i-solar amaseli angabopha OkwaLanga amandla avela ku-spectrum yawo ehlukahlukene futhi ngaleyo ndlela abe nokusebenza kahle okuphezulu. Amaseli elanga atholakalayo namuhla anqunyelwe ukusebenza kahle kwawo okungamaphesenti ayi-15-22 kuphela.
Ucwaningo olushicilelwe ngoJulayi 3 ngo Nature ibonise ukuthi i-silicon i-solar ukusebenza kahle kwamaseli kungakhushulwa kufinyelele kumaphesenti angama-35 ngokusebenzisa umphumela obizwa nge-singlet exciton fission. Kulo mphumela inhlayiya eyodwa yokukhanya (i-photon) ingakhiqiza amapheya e-electron-hole amabili ngokuphambene neyodwa kuphela. I-Single exciton fission ibonakala ezintweni eziningi kusukela yatholakala ngawo-1970. Ucwaningo lwamanje luhlose ukuhumusha lo mphumela okokuqala ngqa ube yinto esebenzayo i-solar iseli.
Abacwaningi badlulisele umphumela owodwa we-exciton fission usuka ku-tetracene - into eyaziwayo ewubonisayo - waba yi-silicon ecwebezelayo. Le nto ye-tetracene iyi-hydrocarbon eziphilayo i-semiconductor. Ukudluliswa kwafinyelelwa ngokubeka ungqimba oluncane lwe-hafnium oxynitride (8 angstrom) phakathi kongqimba lwe-excitonic tetracene ne-silicon. i-solar iseli nokuzihlanganisa.
Lolu ngqimba oluncane lwe-hafnium oxynitride lusebenze njengebhuloho futhi lwenza kwaba khona ukukhiqizwa kwama-photon wamandla aphezulu kungqimba lwe-tetracene okwabe sekubangela ukukhululwa kwama-electron amabili kuseli ye-silicon ngokuphambene nevamile. Lokhu kuzwela kwe-silicon i-solar iseli yehlise ukulahleka kwe-thermalization futhi yanika amandla ukuzwela okungcono ekukhanyeni. Umphumela wamandla we i-solar amaseli aphindaphindeka kabili njengoba okukhiphayo okwengeziwe kwenziwa ezingxenyeni eziluhlaza neziluhlaza okwesibhakabhaka ze-spectrum. Lokhu kungathuthukisa ukusebenza kahle kwe i-solar amaseli ukuya phezulu ngamaphesenti angama-35. Ubuchwepheshe buyahluka kumaseli elanga e-tandem njengoba nje ingeza okwamanje ku-silicon ngaphandle kokwengeza amaseli engeziwe.
Ucwaningo lwamanje lubonise amaseli elanga elanga e-singlet-fission e-silicon angabonisa ukusebenza kahle okwandisiwe futhi ngaleyo ndlela anciphise izindleko zokukhiqiza amandla jikelele zobuchwepheshe belanga.
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{Ungafunda iphepha lokuqala locwaningo ngokuchofoza isixhumanisi se-DOI esinikezwe ngezansi ohlwini lwemithombo ekhonjiwe}
Umthombo (s)
Einzinger, M. et al. 2019. Ukuzwela kwe-silicon nge-singlett exciton fission ku-tetracene. Imvelo. 571. https://doi.org/10.1038/s41586-019-1339-4
