Durability enhancement of all-solid-state electrochromic devices by adjusting the charge density ratio between electrochromic and counter electrode layers

Shin, Minkyung; Lee, Ju Ho; Seo, Intae; Kang, Hyung-Won; Seo, Ji-Hun; Jin, Ho Jun; Kim, Bong Hoon; Tenent, Robert C.; Han, Seung Ho

doi:10.1016/j.solmat.2024.112901

Durability enhancement of all-solid-state electrochromic devices by adjusting the charge density ratio between electrochromic and counter electrode layers

Journal Article · Tue Apr 30 00:00:00 EDT 2024 · Solar Energy Materials and Solar Cells

DOI:https://doi.org/10.1016/j.solmat.2024.112901· OSTI ID:2349290

Shin, Minkyung ^[1]; Lee, Ju Ho ^[2]; Seo, Intae ^[2]; Kang, Hyung-Won ^[2]; Seo, Ji-Hun ^[3]; Jin, Ho Jun ^[4]; Kim, Bong Hoon ^[4]; Tenent, Robert C. ^[5]; ^[6]

Korea Electronics Technology Institute (KETI), Seongnam (Korea, Republic of); Korea Univ., Seoul, (Korea, Republic of)
Korea Electronics Technology Institute (KETI), Seongnam (Korea, Republic of)
Korea Univ., Seoul, (Korea, Republic of)
Daegu Gyeongbuk Institute of Science and Technology (DGIST) (Korea, Republic of)
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
Korea Electronics Technology Institute (KETI), Seongnam (Korea, Republic of); National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Here, owing to an increase in global warming, smart-window devices based on charge-balanced electrochromic devices (ECDs), which exhibit high potential to increase the thermal efficiency of buildings, have gained prominence. However, studies on the fabrication and cycling stability of charge-balanced ECDs are scarce. In this study, WO₃ and NiO_x films were deposited on indium-tin-oxide (ITO)-coated glass substrates by reactive direct-current magnetron sputtering, and the deposition time was varied to control the thickness and charge density of the thin films. Subsequently, the NiO_x/ITO/glass and WO₃/ITO/glass substrates were laminated with a Li-based polymeric electrolyte to fabricate all-solid-state ECDs comprising electrochromic (EC) and counter-electrode (CE) layers in charge-density ratios of 12.6, 6.4, 2.3, and 1.1. Changes in the electrochromic properties, device-layer microstructure, crystal structure, and elemental composition of the as-constructed ECDs before and after degradation were investigated to understand the influence of the charge-density ratio of the EC and CE layers on the long-term durability of ECDs. Increasing the charge-density ratio decreased the cycling stability of the device owing to changes in the microstructure and crystal structure of the NiO_x layer in the microstructural deep-trap sites. Among all the ECDs, those comprising EC and CE layers with similar charge densities showed the most stable optical modulation and highest long-term durability. Finally, based on the aforementioned results, a degradation mechanism for charge-imbalanced all-solid-state ECDs was proposed. This study is expected to open new frontiers in designing optimal-performance electrochemical devices with a wide variety of potential applications.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; Korea Institute of Energy Technology Evaluation and Planning (KETEP)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2349290

Report Number(s):: NREL/JA--5K00-87703; MainId:88478; UUID:4d2cb02b-720c-4c0b-989d-3053c5c1a2f0; MainAdminId:72578

Journal Information:: Solar Energy Materials and Solar Cells, Journal Name: Solar Energy Materials and Solar Cells Vol. 272; ISSN 0927-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
all-solid-state electrochromic device
charge density ratio
complementary structure
cycling stability
deep trap
irreversible reaction

Durability enhancement of all-solid-state electrochromic devices by adjusting the charge density ratio between electrochromic and counter electrode layers

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