A molecular photosensitizer achieves a Voc of 1.24 V enabling highly efficient and stable dye-sensitized solar cells with copper(II/I)-based electrolyte

Dan Zhang, Marko Stojanovic, Yameng Ren (), Yiming Cao, Felix T. Eickemeyer (), Etienne Socie, Nick Vlachopoulos, Jacques-E. Moser, Shaik M. Zakeeruddin, Anders Hagfeldt () and Michael Grätzel ()
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Dan Zhang: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Marko Stojanovic: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Yameng Ren: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Yiming Cao: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Felix T. Eickemeyer: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Etienne Socie: École Polytechnique Fédérale de Lausanne
Nick Vlachopoulos: École Polytechnique Fédérale de Lausanne
Jacques-E. Moser: École Polytechnique Fédérale de Lausanne
Shaik M. Zakeeruddin: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Anders Hagfeldt: École Polytechnique Fédérale de Lausanne
Michael Grätzel: Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract To develop photosensitizers with high open-circuit photovoltage (Voc) is a crucial strategy to enhance the power conversion efficiency (PCE) of co-sensitized solar cells. Here, we show a judiciously tailored organic photosensitizer, coded MS5, featuring the bulky donor N-(2’,4’-bis(dodecyloxy)-[1,1’-biphenyl]-4-yl)-2’,4’-bis(dodecyloxy)-N-phenyl-[1,1’-biphenyl]-4-amine and the electron acceptor 4-(benzo[c][1,2,5]thiadiazol-4-yl)benzoic acid. Employing MS5 with a copper (II/I) electrolyte enables a dye-sensitized solar cell (DSC) to achieve a strikingly high Voc of 1.24 V, with the Voc deficit as low as 130 mV and an ideality factor of merely 1.08. The co-sensitization of MS5 with the wider spectral-response dye XY1b produces a highly efficient and stable DSC with the PCE of 13.5% under standard AM1.5 G, 100 mW cm−2 solar radiation. Remarkably, the co-sensitized solar cell (active area of 2.8 cm2) presents a record PCE of 34.5% under ambient light, rendering it very attractive as an ambient light harvesting energy source for low power electronics.

Date: 2021
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DOI: 10.1038/s41467-021-21945-3

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