Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 9, Pages 6117-6126Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00806
Keywords
dye-sensitized solar cells; organic sensitizer; Naphtho[2,3-c][1,2,5]thiadiazole; 2H-Naphtho[2,3-d][1,2,3]triazole; D-A-pi-A
Funding
- Academia Sinica (AS)
- Ministry of Science and Technology (MOST, Taiwan)
- Instrumental Center of Institute of Chemistry (AS)
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Dipolar dyes comprising an arylamine as the electron donor, a cyanoacrylic acid as electron acceptor, and an electron deficient naphtho[2,3-c][1,2,5]thiadiazole (NTD) or naphtho[2,3-d] [1,2,3]triazole (NTz) entity in the conjugated spacer, were developed and used as the sensitizers in dye-sensitized solar cells (DSSCs). The introduction of the NTD unit into the molecular frame distinctly narrows the HOMO/LUMO gap with electronic absorption extending to >650 nm. However, significant charge trapping and dye aggregation were found in these dyes. Under standard global AM 1.5 G illumination, the best cell photovoltaic performance achieved 6.37 and 7.53% (similar to 94% relative to N719-based standard cell) without and with chenodeoxycholic acid (CDCA) coadsorbent, respectively. Without CDCA, the NTz dyes have higher power conversion efficiency (7.23%) than NTD dyes due to less charge trapping, dye aggregation, and better dark current suppression.
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