期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 8, 页码 3487-3493出版社
AMER CHEMICAL SOC
DOI: 10.1021/am400866s
关键词
dye-sensitized solar cells; low-temperature titanium dioxide; atomic layer deposition; templates; cobalt complex; flexible solar cell
资金
- EU FP7 project ORION [NMP-229036]
- Balzan foundation
- Center for Advanced Molecular Photovoltaics by King Abdullah University of Science and Technology (KAUST [KUS-C1-015- 21]
- Swiss Commission for Technology and Innovation (CTI) [13369.1 PFFLR-NM]
Low-temperature processing of dye-sensitized solar cells (DSCs) is crucial to enable commercialization with low-cost, plastic substrates. Prior studies have focused on mechanical compression of premade particles on plastic or glass substrates; however, this did not yield sufficient interconnections for good carrier transport. Furthermore, such compression can lead to more heterogeneous porosity. To circumvent these problems, we have developed a low-temperature processing route for photoanodes where crystalline TiO2 is deposited onto well-defined, mesoporous templates. The TiO2 is grown by atomic layer deposition (ALD), and the crystalline films are achieved at a growth temperature of 200 degrees C. The ALD TiO2 thickness was systematically studied in terms of charge transport and performance to lead to optimized photovoltaic performance. We found that a 15 nm TiO2 overlayer on an 8 mu m thick SiO2 film leads to a high power conversion efficiency of 7.1% with the state-of-the-art zinc porphyrin sensitizer and cobalt bipyridine redox mediator.
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