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Title: | Selectively absorbing small-molecule solar cells for self-powered electrochromic windows | Authors: | Jia, Xiangkun Baird, Elizabeth Christine Blochwitz-Nimoth, Jan Reineke, Sebastian VANDEWAL, Koen SPOLTORE, Donato |
Issue Date: | 2021 | Publisher: | ELSEVIER | Source: | NANO ENERGY, 89 (Art N° 106404) | Abstract: | Dynamic control of solar transmission by photovoltaic-powered electrochromic smart windows is an up-andcoming approach towards the reduction of energy consumption in buildings. Selectively-absorbing transparent organic solar cells are capable of exhibiting excellent visible-light transparency as well as respectable power conversion efficiencies. This work presents three different transparent small-molecule solar cells (TSCs) with an area of 2.52 cm2, two of which are UV-absorbing and one of which absorbs in the NIR, each in combination with an organic electrochromic device (EC). The NIR-absorbing TSC uses a BDP-OMe:C60 combination, and has a power conversion efficiency of 4% with an average visible light transmission (AVT) of 40%. The two UVharvesting systems, alpha-6T/B4PYMPM and NPB:B4PYMPM, each have an AVT of 50-65%, as well as high opencircuit voltages of 1.5-2.0 V. We demonstrate that these photogenerated voltages are sufficient to power a fluoran dye-based organic EC, which has excellent optical properties: its color ranges from highly transparent to deep black, and its on/off contrast ratio is higher than 80% in the range between 390 nm and 640 nm. Selfpowered smart windows made by the combination of TSCs and ECs provide a way to significantly reduce energy consumption from air conditioning and lighting, towards zero-energy buildings. | Notes: | Reineke, S; Spoltore, D (corresponding author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany.; Reineke, S; Spoltore, D (corresponding author), Tech Univ Dresden, Inst Appl Phys, Nothnitzer Str 61, D-01187 Dresden, Germany.; Vandewal, K (corresponding author), Hasselt Univ, Inst Mat Res IMO IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. sebastian.reineke@tu-dresden.de; koen.vandewal@uhasselt.be; donato.spoltore@tu-dresden.de |
Keywords: | Small-molecules;Solar cells;Electrochromic devices;Smart windows;Self-sustainable | Document URI: | http://hdl.handle.net/1942/36045 | ISSN: | 2211-2855 | e-ISSN: | 2211-3282 | DOI: | 10.1016/j.nanoen.2021.106404 | ISI #: | WOS:000709618500001 | Rights: | 2021 Elsevier Ltd. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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