Lead-free Perovskites for Applications of Photovoltaics and Photocatalysis
Eric Wei-Guang Diau a
a National Chiao Tung University Hsinchu, Taiwan, 1001 University Road, Hsinchu, Hsinchu, Taiwan, Province of China
Invited Speaker Session, Eric Wei-Guang Diau, presentation 032
DOI: https://doi.org/10.29363/nanoge.iperop.2020.032
Publication date: 14th October 2019

My talk in this section can be divided into two parts. First, we investigated the doping effect of bulky organic cations with ethylenediammonium diiodide (EDAI2) as a co-additive to enhance the performance and stability of the FASnI3 perovskite solar cells.[1] The additive EDAI2 plays a key role to cause slow passivation of the surface and relaxation of crystal strain such that the device performance increases gradually with increasing duration of storage. In the presence of EDAI2 additive (1 %) the FASnI3 device attained the best initial efficiency 7.4 % and the device performance continuously increased as a function of duration of storage; the maximum PCE, 8.9 %, was obtained for a device stored in a glove box for over 1400 h with only slight degradation for storage beyond 2000 h. I will report hybrid tin-based perovskite solar cells that incorporate a non-polar organic cation, guanidinium (GA+), in varied proportions into FASnI3 crystal structure in the presence of 1 % EDAI2.[2] The device performance was optimized at precursor ratio GAI:FAI = 20:80 to attain PCE 8.5 % when prepared freshly; the efficiencies continuously increased to attain a record PCE 9.6 % after storage for 2000 h, which is a world record at the time the paper was published.[3] For photocatalysis, we report a new series of bismuth-based perovskite nanocrystals (PeNCs) as effective photocatalysts for CO2 reduction to produce methane and carbon monoxide with great performance by gas-solid reaction. Detailed studies have been performed by using electron paramagnetic resonance (EPR) and Diffuse Reflection Infrared Fourier Transfer (DRIFT) spectral techniques to propose the plausible mechanism for CO and CH4 formation via CO2 photoreduction by Bi-based PeNC photocatalysts.

Reference:

[1] E. Jokar, C.-H. Chien, A. Fathi, M. Rameez, Y.-H. Chang and E. W.-G. Diau,* Energy Environ. Sci., 2018, 11, 2353-2362

[2] E. Jokar, C.-H. Chien, C.-M. Tsai, A. Fathi and E. W.-G. Diau,* Adv. Mater., 2019, 19, 1804835

[3] E. W.-G. Diau,* E. Jokar and M. Rameez, ACS Energy Lett., 2019, 4, 1930-1937

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