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Post-Assembly Atomic Layer Deposition of Ultrathin Metal-Oxide Coatings Enhances the Performance of an Organic Dye-Sensitized Solar Cell by Suppressing Dye Aggregation
- Post-Assembly Atomic Layer Deposition of Ultrathin Metal-Oxide Coatings Enhances the Performance of an Organic Dye-Sensitized Solar Cell by Suppressing Dye Aggregation
- Son, HJ[Son, Ho-Jin]; Kim, CH[Kim, Chul Hoon]; Kim, DW[Kim, Dong Wook]; Jeong, NC[Jeong, Nak Cheon]; Prasittichai, C[Prasittichai, Chaiya]; Luo, LL[Luo, Langli]; Wu, JS[Wu, Jinsong]; Farha, OK[Farha, Omar K.]; Wasielewski, MR[Wasielewski, Michael R.]; Hupp, JT[Hupp, Joseph T.]
- DGIST Authors
- Jeong, NC[Jeong, Nak Cheon]
- Issue Date
- ACS Applied Materials and Interfaces, 7(9), 5150-5159
- Article Type
- Atomic Layer Deposition; Atomic Layer Deposition (ALD); Atoms; Chenodeoxycholic Acid; Concomitant Reduction; Conversion Efficiency; Deposition; Dye-Sensitized Solar Cells (DSCs); Dye Aggregation; Electron Injection; Energy Conversion; Excited State Lifetimes; Excited States; Interfacial Electron Injection; Light to Electrical Energy Conversion; Post-Treatment; Protective Coatings; Significant Mechanism; Solar Cells; Titanium Dioxide; Ultra-Fast Spectroscopies
- Dye aggregation and concomitant reduction of dye excited-state lifetimes and electron-injection yields constitute a significant mechanism for diminution of light-to-electrical energy conversion efficiencies in many dye-sensitized solar cells (DSCs). For TiO2-based DSCs prepared with an archetypal donor-acceptor organic dye, (E)-2-cyano-3-(5′-(5′′-(p-(diphenylamino)phenyl)-thiophen-2′′-yl)thiophen-2′-yl)acrylic acid (OrgD), we find, in part via ultrafast spectroscopy measurements, that postdye-adsorption atomic layer deposition (ALD) of ultrathin layers of either TiO2 or Al2O3 effectively reverses residual aggregation. Notably, the ALD treatment is significantly more effective than the widely used aggregation-inhibiting coadsorbent, chenodeoxycholic acid. Primarily because of reversal of OrgD aggregation, and resulting improved injection yields, ALD post-treatment engenders a 30+% increase in overall energy conversion efficiency. A secondary contributor to increased currents and efficiencies is an ALD-induced attenuation of the rate of interception of injected electrons, resulting in slightly more efficient charge collection. © 2015 American Chemical Society.
- American Chemical Society
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- Emerging Materials ScienceETC1. Journal Articles
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