A multi-technique approach to study the microstructural properties of tin-based transparent conductive oxides

Transparent conductive oxides (TCOs) are semiconductor-like materials that exhibit high electrical conductivity and high optical transparency combined. They are adopted in various applications ranging from gas sensors, to electrochromic windows, to photovoltaic cells. Indium-based TCOs represent the industry standard. Nevertheless, indium is among the less abundant elements in the earth crust and forecasts based on its current consumption envisage an urgent need to replace it. Tin-based TCOs are a promising alternative, since their opto- electronic characteristics mimic the ones of indium-based materials. This thesis aims to investigate the link between optoelectronic and microstructural properties of tin dioxide and zinc tin oxide (ZTO) with a composition Zn0.05Sn0.30O0.65 and their stability when submitted to thermal treatments. Indeed, lots of practi- cal applications require the TCO to operate in high temperature conditions. To conduct this study, a combination of analytical techniques, such as transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X- ray diffraction (XRD), electron paramagnetic resonance (EPR) and differential scanning calorimetry (DSC) was employed. Amorphous SnO2 and ZTO were deposited by RF sputtering and annealed up to 1050°C in different atmospheres. The influence of annealing temperature and atmosphere were decoupled and led us to an in-depth comprehension of the mechanisms governing the optoelectronic properties of both materials. When annealed in air, between room temperature and 300°C, ZTO exhibits increased mobility and carrier concentration with respect to the as-deposited state. This increase, investigated with DSC, was ascribed to a structural relaxation that allows point defects to release electrons in conduction band. Between 300°C and 500°C atmospheric oxygen passivates oxygen vacancies, drastically decreasing the carrier concentration and therefore causing a large drop of the conductivity. EPR experiments allowed to ascribe the drop in conductivity to the decrease of carrier concentration, which occurs slightly before the phase change. At 570°C (and 930°C for the case of vacuum annealing) the phase change occurs and the ZTO crystallizes in the rutile form of SnO2. The material becomes completely insulating. When the temperature is increased to 1050°C, evaporation of zinc is observed. In order to improve the electrical conductivity of ZTO at high temperature, a doping strategy was implemented starting from DFT calculations conducted by a partner group, who screened among the entire periodic table, which elements are the best candidates to act as n-dopants for ZTO. Bromine and iodine were retained, since they were found to be the most energetically favorable to become substitutional defects for a tin site. An exploratory doping route is therefore presented and the treated samples analyzed with TEM, EDX and UV-VIS-IR spectroscopy. Finally, the structural properties of an indium-based TCO (zirconium-doped indium oxide) were investigated and used as a benchmark to propose a crystallization model for the tin-based, as well as the indium-based materials. The influence of pa- rameters such as the material thickness, annealing atmosphere and temperature and deposition pressure are discussed for both materials

Impact and Associations of Atopic Dermatitis Out-of-Pocket Health Care Expenses in the United States

BACKGROUND: Atopic dermatitis (AD) is associated with substantial financial cost, including increased out-of-pocket (OOP) expenses. Associations and impact of OOP costs are poorly understood. OBJECTIVE: The aim of the study was to characterize the impact and associations of OOP health care expenses for AD. METHODS: A 25-question online survey was administered to National Eczema Association members (N = 113,502). Inclusion criteria (US residents aged ≥18 years; self-reported AD or primary caregiver of individual with AD) were met by 77.3% (1118 of 1447). RESULTS: Respondents with monthly OOP expenses greater than $200 were more likely to have increased AD severity, flares, health care provider visits, prescription polypharmacy, use of step-up therapy, frequent skin infections, and poorer disease control ( P \u3c 0.005 for all). Respondents with OOP yearly expenditures greater than$1000 had similar associations and additionally increased rates of comorbid asthma, allergic rhinitis, and anxiety/depression ( P \u3c 0.005 for all). A total of 64.6% (n = 624) reported harmful household financial impact of OOP expenses. Predictors of harmful impact included severe AD (adjusted odds ratio [95% confidence interval], 2.62 [1.11-6.19], P = 0.04), comorbid asthma (1.42 [1.07-1.87], P = 0.03), 5 health care provider visits or more in a year (2.80 [1.62-4.82], P = 0.0007), greater than $200 OOP monthly expenditures (2.16 [1.45-3.22], 0.0006), and$1000 annual OOP expenditures or more (4.56 [3.31-6.27], P \u3c 0.0001). CONCLUSIONS: Out-of-pocket expenses for AD significantly impact household finances. Clinical interventions are needed to minimize OOP expenses while optimizing care outcomes.Capsule Summary:• Atopic dermatitis (AD) is associated with significant financial cost, including increased out-of-pocket (OOP) expenses, although the impact and associations of OOP health care expenses for AD management are not well understood.• The OOP health care expenses related to AD are associated with increased disease severity and health care utilization and significantly impact the household finances of patients and caregivers.• Health care providers should be mindful of the OOP financial burden related to AD management and engage in shared decision making to create a treatment plan that is practical and effective and minimizes household financial impact

Factors related to eczema clinical trial participation among adult patients and caregivers

Background: Eczema can be difficult to treat due to its chronic, heterogeneous nature. Effective long-term treatments for adults and children are needed. Little is known about what considerations influence eczema patient and caregiver decision-making regarding clinical trial participation (CTP). This study identifies factors that adult patients and caregivers consider important for CTP and determines if differences exist between these groups. Methods: A 46-question survey was administered May 1-June 6, 2020, to adults and caregivers of children with eczema. Respondents were asked to rate the importance of a series of factors when considering CTP; adults and caregivers were compared. Results: Out of 31 total factors queried, eleven factors differed significantly in importance ratings between adults (n = 470) and caregivers (n = 134). The route of therapy (p = 0.030), side effects (p = 0.014), washout period (p = 0.028), receiving a placebo (p = 0.027), rescue therapy option (p = 0.033), access to test drug after trial (p = 0.027), sticking with the clinical trial regimen (p = 0.025), fit with work/school (p = 0.005), impact on overall health (p = 0.008), and satisfaction with current treatment (p = 0.033) were all more likely to be rated as important by caregivers than by adult patients. Only altruism was rated more highly by adult patients than caregivers (p = 0.027). Conclusions: Caregivers are more likely than adults to attribute high importance to factors that may affect their child's eczema or well-being when considering CTP. Patient-centered CTP education materials and decision aids may support patients and caregivers in CTP decision-making

The financial burden of out-of-pocket healthcare expenses on caregivers of children with atopic dermatitis in the United States

BACKGROUND: Atopic dermatitis (AD) is associated with elevated financial costs, including out-of-pocket (OOP) expenses. Yet, the full burden of OOP expenses in children with AD is poorly understood. OBJECTIVES: We sought to characterise categories, impact, and associations of caregiver-reported OOP AD healthcare expenses for US children. METHODS: An online survey was administered to National Eczema Association members ( = 113 502). Inclusion criteria (US resident; respondent age ≥18; self or caregiver report of AD diagnosis) was met by 77.3% (1118/1447) of those who completed the questionnaire. RESULTS: Caregivers of children (\u3c18 years) with AD reported increased healthcare provider (HCP) visits, comorbid food allergy, cutaneous infections, and topical antimicrobial use ( \u3c 0.005 for all), and increased OOP expenses for hospitalisation, emergency room visits, emollients, hygiene/bathing products, childcare, and specialised cleaning products, and clothing/bedding ( \u3c 0.05 for all) compared to adults with AD. Children with AD had increased median total yearly OOP expenditures ($860 vs.$500, = 0.002) and were more likely to spend ≥$1000 OOP per year (48.9$1000 were associated with increased AD severity, flares, HCP visits, prescription polypharmacy, and step-up therapy use ( \u3c 0.005 for all) compared with adults. Predictors of harmful financial impact among children included black race (adjusted OR [95% confidence interval]: 3.86 [1.66-8.98] = 0.002) and ≥$1000 annual OOP expenditures (6.98 [3.46-14.08], \u3c 0.0001). CONCLUSION: Children with AD have unique and increased OOP expenses that are associated with significant disease burden. Strategies are needed to reduce OOP costs and improve clinical outcomes in children with AD

Financial burden and impact of atopic dermatitis out-of-pocket healthcare expenses among black individuals in the United States

Black race is associated with increased atopic dermatitis (AD) severity and healthcare resource utilization. However, the burden of out-of-pocket (OOP) expenses among black individuals with AD is not well understood. We sought to characterize the categories and impact of OOP healthcare expenses associated with AD management among black individuals. A 25-question voluntary online survey was administered to National Eczema Association members (N = 113,502). Inclusion criteria (US residents age ≥ 18 years; self-report of AD or primary caregivers of individuals with AD) was met by 77.3% (1118/1447) of respondents. Black individuals with AD were younger, had lower household income, Medicaid, urban residence, poor AD control and frequent skin infections (P ≤ 0.02). Blacks vs. non-blacks reported more OOP costs for prescription medications covered (74.2% vs. 63.6%, P = 0.04) and not covered (65.1% vs. 46.5%, P = 0.0004) by insurance, emergency room visits (22.1% vs. 11.8%, P = 0.005), and outpatient laboratory testing (33.3% vs. 21.8%, P = 0.01). Black race was associated with increased household financial impact from OOP expenses (P = 0.0009), and predictors of financial impact included minimally controlled AD (adjusted OR [95% CI] 13.88 [1.63-117.96], P = 0.02), systemic therapy (4.34 [1.63-11.54], 0.003), \u3e $200 monthly OOP expenses (14.28 [3.42-59.60], P = 0.0003), and Medicaid (4.02 [1.15-14.07], P = 0.03). Blacks with Medicaid had higher odds of harmful financial impact (3.32 [1.77-6.24], P = 0.0002) than those of black race (1.81 [1.04-3.15], P = 0.04) or with Medicaid (1.39 [1.02-1.88], P = 0.04) alone. Black race is associated with increased OOP costs for AD and significant household financial impact. Targeted interventions are needed to address financial disparities in AD

Factors facilitating shared decision making in eczema: Met and unmet needs from the patient perspectiveCapsule Summary

Background: Research has shown that eczema patients prefer some degree of shared control over treatment decisions, but little is known about factors perceived to be important to facilitate shared decision making (SDM). Objective: To determine factors eczema patients and caregivers consider to be important for SDM, and how often they experience them with their eczema healthcare provider (HCP). Methods: A cross-sectional survey study (64 questions) was conducted, which included factors related to SDM rated by respondents on a Likert scale for importance, and how often these factors were true with their current eczema HCP. Results: Respondents (840, response rate 62.4%) most frequently rated their health literacy and communication skills as important for SDM. Factors which indicated a strong provider-patient relationship, and HCPs who initiate treatment conversations were also deemed beneficial. Low importance was placed on concordant HCP race/ethnicity, however, of those who did rate it as important, 53/91 identified as Black (half of all Black respondents). Limitations: A high proportion of respondents were aware of the term SDM prior to the survey. Conclusions: SDM is more likely to be facilitated when patient education and empowerment are coupled with HCPs who initiate treatment discussions, maintain compassion resilience, and listen to patient perspectives