title: Spectral splitting photovoltaics using perovskite and wideband dye-sensitized solar cells.
abstract: The extension of the light absorption of photovoltaics into the near-infrared region is important to increase the energy conversion efficiency. Although the progress of the lead halide perovskite solar cells is remarkable, and high conversion efficiency of >20% has been reached, their absorption limit on the long-wavelength side is ∼800 nm. To further enhance the conversion efficiency of perovskite-based photovoltaics, a hybridized system with near-infrared photovoltaics is a useful approach. Here we report a panchromatic sensitizer, coded DX3, that exhibits a broad response into the near-infrared, up to ∼1100 nm, and a photocurrent density exceeding 30 mA cm(-2) in simulated air mass 1.5 standard solar radiation. Using the DX3-based dye-sensitized solar cell in conjunction with a perovskite cell that harvests visible light, the hybridized mesoscopic photovoltaics achieved a conversion efficiency of 21.5% using a system of spectral splitting.
authors.affiliation: Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan.
authors.forename: Takumi
authors.initials: T
authors.lastname: Kinoshita
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photomolecular Science, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Kazuteru
authors.initials: K
authors.lastname: Nonomura
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Korea.
authors.forename: Nam
authors.initials: N
authors.lastname: Joong Jeon
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Giordano
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Antonio
authors.initials: A
authors.lastname: Abate
authors.affiliation: Komaba Organization for Educational Excellence (KOMEX), The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Uchida
authors.affiliation: Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan.
authors.forename: Takaya
authors.initials: T
authors.lastname: Kubo
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeong-Ro, Yuseong-Gu, Daejeon 305-600, Korea.|School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Korea.
authors.forename: Sang Il
authors.initials: SI
authors.lastname: Seok
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Mohammad Khaja
authors.initials: MK
authors.lastname: Nazeeruddin
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photomolecular Science, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
authors.affiliation: Department of Chemistry and Chemical Engineering, Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology, Station 6, CH-1015 Lausanne, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.affiliation: Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Segawa