scholarly journals Moisture Stability of Perovskite Solar Cells Processed in Supercritical Carbon Dioxide

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7570
Author(s):  
Gilbert Annohene ◽  
Gary Tepper
Keyword(s):  
Carbon Dioxide ◽  
Solar Cells ◽  
Relative Humidity ◽  
Supercritical Carbon Dioxide ◽  
Perovskite Solar Cells ◽  
Simultaneous Exposure ◽  
Different Temperatures ◽  
Moisture Stability ◽  
Different Levels ◽  
Supercritical Carbon

Performance degradation under environmental conditions currently limits the practical utility of perovskite-based solar cells. The moisture stability of CH3NH3PbI3 perovskite films and solar cells was measured during exposure to three different levels of relative humidity. The films were crystallized at two different temperatures with and without simultaneous exposure to supercritical carbon dioxide. The film crystallinity, optical absorption, and device photoconversion efficiency was measured over time for three relative humidity levels and both crystallization methods. It was determined that film crystallization in supercritical CO2 resulted in significant improvement in moisture stability for films processed at 50 °C, but negligible improvement in stability for films processed at 100 °C.

scholarly journals Determination of Oleanolic and Ursolic Acids inHedyotis diffusaUsing Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Ming-Chi Wei ◽  
Yu-Chiao Yang ◽  
Show-Jen Hong
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
High Performance ◽  
Extraction Yield ◽  
Extraction Time ◽  
Different Temperatures ◽  
Ultrasound Assisted ◽  
High Concentrations ◽  
Static Extraction ◽  
Supercritical Carbon

Oleanolic acid (OA) and ursolic acid (UA) were extracted fromHedyotis diffusausing a hyphenated procedure of ultrasound-assisted and supercritical carbon dioxide (HSC–CO2) extraction at different temperatures, pressures, cosolvent percentages, and SC–CO2flow rates. The results indicated that these parameters significantly affected the extraction yield. The maximal yields of OA (0.917 mg/g of dry plant) and UA (3.540 mg/g of dry plant) were obtained at a dynamic extraction time of 110 min, a static extraction time of 15 min, 28.2 MPa, and 56°C with a 12.5% (v/v) cosolvent (ethanol/water = 82/18, v/v) and SC–CO2flowing at 2.3 mL/min (STP). The extracted yields were then analyzed by high performance liquid chromatography (HPLC) to quantify the OA and UA. The present findings revealed thatH. diffusais a potential source of OA and UA. In addition, using the hyphenated procedure for extraction is a promising and alternative process for recovering OA and UA fromH. diffusaat high concentrations.

scholarly journals Extraction and Solubility Modeling of Anthocyanins Rich Extract from Hibiscus sabdariffa L. using Supercritical Carbon Dioxide

2021 ◽  
Vol 17 (6) ◽  
pp. 720-730
Author(s):  
Zuhaili Idham ◽  
Nicky Rahmana Putra ◽  
Hasmida Nasir ◽  
Lee Nian Yian ◽  
Nor Faadila Mohd Idrus ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Extraction Yield ◽  
Hibiscus Sabdariffa ◽  
Different Temperatures ◽  
Supercritical Carbon

This study aimed to evaluate the extraction yield, and anthocyanins content of Hibiscus sabdariffa L. calyces extract using different temperatures (T) at 50 - 70°C, pressure (P) at 8 - 12 MPa, and modifier ratio at 5 - 10%.  

Supercritical carbon dioxide as a solvent for deposition of a tailored dye in dye sensitized solar cells

2011 ◽  
Vol 13 (12) ◽  
pp. 3329 ◽  
Author(s):  
Subashani Maniam ◽  
Andrew B. Holmes ◽  
Julia Krstina ◽  
Gary A. Leeke ◽  
Gavin E. Collis
Keyword(s):  
Carbon Dioxide ◽  
Solar Cells ◽  
Supercritical Carbon Dioxide ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Supercritical Carbon

Boosting the efficiency of solution-based CZTSSe solar cells by supercritical carbon dioxide treatment

2020 ◽  
Vol 22 (11) ◽  
pp. 3597-3607 ◽  
Author(s):  
Hai-Qin Xiao ◽  
Wen-Hui Zhou ◽  
Dong-Xing Kou ◽  
Zheng-Ji Zhou ◽  
Yue-Na Meng ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Solar Cells ◽  
Supercritical Carbon Dioxide ◽  
Organic Chemicals ◽  
Efficient Approach ◽  
Supercritical Carbon

Supercritical carbon dioxide treatment proved to be efficient approach that can extract parts of organic chemicals in CZTSSe precursor films, thus reducing carbonaceous residues in CZTSSe films and boosting efficiency of CZTSSe-based solar cells.

A NEW SIMPLE CORRELATION FOR CALCULATING SOLUBILITY OF DRUGS IN SUPERCRITICAL CARBON DIOXIDE

2013 ◽  
Vol 12 (07) ◽  
pp. 1350062 ◽  
Author(s):  
ALI ZEINOLABEDINI HEZAVE ◽  
MOSTAFA LASHKARBOLOOKI
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Equations Of State ◽  
Mixing Rules ◽  
Simple Correlation ◽  
The Past ◽  
Different Temperatures ◽  
Temperature And Pressure ◽  
Fitting Parameters ◽  
Supercritical Carbon

During the past 20 years, supercritical fluid (SCF) based technologies have been gaining an increasing attention through the academic and industrial communities due to its advantages. One of the most important parameter for any supercritical-based technologies is the knowledge of the solute solubility at different pressures and temperatures. But, due to several concerns e.g. time and expense, measuring the solubility of all compounds in wide ranges of temperature and pressure is not possible. Respect to this, a new empirical correlation with four fitting parameters has been proposed to correlate the solubility of pharmaceuticals in different temperatures and pressures. The obtained results compared with four widely used density based correlations including Mendez-Santiago and Teja (MST), Bartle et al., Chrastil, Kumar and Johnston (KJ) revealed rather good capability of the proposed simple correlation for predicting the solubility of solutes in supercritical carbon dioxide (SC- CO 2). At last, the obtained results compared with the results of three Equations of State (EoS's) with three different mixing rules.

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