10.21979/N9/U8RXH5
Li, Mingjie
(Nanyang Technological University)
Saikat Bhaumik
(Nanyang Technological University)
Teck Wee Goh
(Nanyang Technological University)
Muduli Subas Kumar
(Nanyang Technological University)
Natalia Yantara
(Nanyang Technological University)
Michael Gra¨tzel
(Nanyang Technological University)
Subodh Mhaisalkar
(Nanyang Technological University)
Nripan Mathews
(Nanyang Technological University)
Sum, Tze Chien
0000-0003-4049-2719
(Nanyang Technological University)
Replication Data for: Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals
DR-NTU (Data)
2019
doi:10.21979/N9/U8RXH5/MZ0TQX
doi:10.21979/N9/U8RXH5/50DUM2
doi:10.21979/N9/U8RXH5/C0Q3MB
doi:10.21979/N9/U8RXH5/ETRHJE
doi:10.21979/N9/U8RXH5/OADTYW
doi:10.21979/N9/U8RXH5/TF0VVU
doi:10.21979/N9/U8RXH5/5VDC34
doi:10.21979/N9/U8RXH5/7BGO9O
doi:10.21979/N9/U8RXH5/9NCR5N
doi:10.21979/N9/U8RXH5/NLCQVF
doi:10.21979/N9/U8RXH5/HNV0WD
doi:10.21979/N9/U8RXH5/KBE11C
doi:10.21979/N9/U8RXH5/UFYS0T
doi:10.21979/N9/U8RXH5/7UHUHQ
doi:10.21979/N9/U8RXH5/4NMPHI
doi:10.21979/N9/U8RXH5/T84NJE
doi:10.21979/N9/U8RXH5/UJRDNC
doi:10.21979/N9/U8RXH5/2QYGX0
doi:10.21979/N9/U8RXH5/WQNRRF
doi:10.21979/N9/U8RXH5/67V3TI
doi:10.21979/N9/U8RXH5/XTBRGH
doi:10.21979/N9/U8RXH5/9I40KO
Hot-carrier solar cells can overcome the Shockley–Queisser limit by harvesting excess energy from hot carriers. Inorganic semiconductor nanocrystals are considered prime candidates. However, hot-carrier harvesting is compromised by competitive relaxation pathways (for example, intraband Auger process and defects) that overwhelm their phonon bottlenecks. Here we show colloidal halide perovskite nanocrystals transcend these limitations and exhibit around two orders slower hot-carrier cooling times and around four times larger hot-carrier temperatures than their bulk-film counterparts. Under low pump excitation, hot-carrier cooling mediated by a phonon bottleneck is surprisingly slower in smaller nanocrystals (contrasting with conventional nanocrystals). At high pump fluence, Auger heating dominates hot-carrier cooling, which is slower in larger nanocrystals (hitherto unobserved in conventional nanocrystals). Importantly, we demonstrate efficient room temperature hot-electrons extraction (up toB83%) by an energy-selective electron acceptor layer within 1 ps from surface-treated perovskite NCs thin films. These insights enable fresh approaches for extremely thin absorber and concentrator-type hot-carrier solar cells.
Sum Tze Chien
(Nanyang Technological University)