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Stable and Colorful Perovskite Solar Cells Using a Nonperiodic SiO2/TiO2 Multi-Nanolayer Filter
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posted on 2019-08-20, 13:36 authored by Gang Yeol Yoo, Randi Azmi, Changwook Kim, Woong Kim, Byoung Koun Min, Sung-Yeon Jang, Young Rag DoWhile
research on building-integrated photovoltaics (BIPVs) has
mainly focused on power-generating window applications, the utilization
of other underutilized surface areas in buildings, including exteriors,
facades, and rooftops, has still not been fully explored. The most
important requirements for BIPVs are color, power conversion efficiency
(PCE), and long-term stability. In this work, we achieved colorful
(red, green, blue, RGB) perovskite solar cells (PSCs) with minimized
PCE loss (<10%) and enhanced photostability by exploiting the optical
properties of nonperiodic multi-nanolayer, narrow-bandwidth reflective
filters (NBRFs). The NBRFs were fabricated by multilayering high-index
TiO2/low-index SiO2 in a nonperiodic manner,
which allowed devices to demonstrate various colors with effectively
suppressed unwanted baseline ripple-shape reflectance. The PCEs of
PSCs with nonperiodic RGB-NBRFs were 18.0%, 18.6%, and 18.9%, which
represent reductions of only 10%, 7%, and 6% of PCE values, respectively,
compared to a black control PSC (20.1%). Moreover, the photostability
of the PSCs was substantially improved by using the NBRFs because
of ultraviolet blocking in the TiO2 layers. The G-PSC retained
65% of the initial PCE after 60 h of continuous illumination (AM 1.5G
one sun) at the maximum power point, whereas the black PSC retained
only 30%. Aesthetic color value, low PCE loss, and enhanced photostability
of PSCs were simultaneously achieved by employing our NBRFs, making
this a promising strategy with potential applicability in power-generating
building exteriors.
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PCE lossBIPVnonperiodic RGB-NBRFssurface areas60 hbuilding-integrated photovoltaicspower conversion efficiencypower-generating window applicationsG-PSCPCE valuesPSCnonperiodic multi-nanolayerbaseline ripple-shape reflectancepower-generating building exteriorsphotostabilityTiO 2 layersColorful Perovskite Solar CellsAM 1.5 Gpower pointnonperiodic manner
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