Enhancement of perovskite-based solar cells employing core-shell metal nanoparticles.
Recently, inorganic and hybrid light absorbers such as quantum dots and organometal halide perovskites have been studied and applied in fabricating thin-film photovoltaic devices because of their low-cost and potential for high efficiency. Further boosting the performance of solution processed thin-film solar cells without detrimentally increasing the complexity of the device architecture is critically important for commercialization. Here, we demonstrate photocurrent and efficiency enhancement in meso-superstructured organometal halide perovskite solar cells incorporating core-shell Au@SiO2 nanoparticles (NPs) delivering a device efficiency of up to 11.4%. We attribute the origin of enhanced photocurrent to a previously unobserved and unexpected mechanism of reduced exciton binding energy with the incorporation of the metal nanoparticles, rather than enhanced light absorption. Our findings represent a new aspect and lever for the application of metal nanoparticles in photovoltaics and could lead to facile tuning of exciton binding energies in perovskite semiconductors.
Department of Physics, University of Oxford , Clarendon Laboratory, Parks Road, Oxford, United Kingdom.
Wei
W
Zhang
Michael
M
Saliba
Samuel D
SD
Stranks
Yao
Y
Sun
Xian
X
Shi
Ulrich
U
Wiesner
Henry J
HJ
Snaith
D017610:Calcium Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry*; D012666:Semiconductors; D012822:Silicon Dioxide / Q000737:chemistry; D012993:Solar Energy; D012996:Solutions / Q000737:chemistry; D013472:Sunlight; D014025:Titanium / Q000737:chemistry*
D017610:Calcium Compounds; D010087:Oxides; D012996:Solutions; C059910:perovskite; D006046:Gold; D012822:Silicon Dioxide; D014025:Titanium