Effects of deposition of an ultra-thin Al2O3 layer via atomic layer deposition on electrochromic property, selfdischarge, and discharge capacity of photo-electrochromic devices
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Photo-electrochromic devices (PECDs) can be spontaneously colored by sunlight and used as energy storage devices. The major obstacle to improving the performance of PECDs is the self-discharge at the interface between electrolyte andelectrochromic layers. To prevent self-discharge, we deposited ultra-thin Al2O3 films on the WO3 electrochromic layer usingatomic layer deposition (ALD). The ALD-deposited Al2O3 layer effectively suppressed the self-discharge phenomenon thatresults from the reduction of iodine. Therefore, the transmittance modulation (ΔT), photocharged voltage, and dischargecapacity increased with an increasing number of ALD cycles. Specifically, the discharge capacity of the PECD-A5 samplefabricated with five ALD cycles increased by 63.7% compared to the PECD without an Al2O3 layer. However, the relativelythick Al2O3 layer of the PECD-A10 sample fabricated with ten ALD cycles resulted in performance degradation due to theslow Li+ ion diffusion rate.
Abstract
Photo-electrochromic devices (PECDs) can be spontaneously colored by sunlight and used as energy storage devices. The major obstacle to improving the performance of PECDs is the self-discharge at the interface between electrolyte andelectrochromic layers. To prevent self-discharge, we deposited ultra-thin Al2O3 films on the WO3 electrochromic layer usingatomic layer deposition (ALD). The ALD-deposited Al2O3 layer effectively suppressed the self-discharge phenomenon thatresults from the reduction of iodine. Therefore, the transmittance modulation (ΔT), photocharged voltage, and dischargecapacity increased with an increasing number of ALD cycles. Specifically, the discharge capacity of the PECD-A5 samplefabricated with five ALD cycles increased by 63.7% compared to the PECD without an Al2O3 layer. However, the relativelythick Al2O3 layer of the PECD-A10 sample fabricated with ten ALD cycles resulted in performance degradation due to theslow Li+ ion diffusion rate.
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