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Donor−acceptor (D−A) small molecules are regarded as promising hole-transporting materials for perovskite solar cells (PSCs) due to their tunable optoelectronic properties. This paper reports the design, synthesis and characterization of three novel isomeric D-π-A small molecules PY1, PY2 and PY3. The chemical structures of the molecules consist of a pyrazolo[1,5-a]pyrimidine acceptor core functionalized with one 3,6-bis(4,4′-dimethoxydiphenylamino)carbazole (3,6-CzDMPA) donor moiety via a phenyl π-spacer at the 3, 5 and 7 positions, respectively. The isolated compounds possess suitable energy levels, sufficient thermal stability (Td > 400 °C), molecular glass behavior with Tg values in the range of 127−136 °C slightly higher than that of the reference material Spiro-OMeTAD (126 °C) and acceptable hydrophobicity. Undoped PY1 demonstrates the highest hole mobility (3 × 10−6 cm2 V−1 s−1) compared to PY2 and PY3 (1.3 × 10−6 cm2 V−1 s−1). The whole isomers were incorporated as doped HTMs in planar n-i-p PSCs based on double cation perovskite FA0.85Cs0.15Pb(I0.85Br0.15)3. The non-optimized device fabricated using PY1 exhibited a power conversion efficiency (PCE) of 12.41%, similar to that obtained using the reference, Spiro-OMeTAD, which demonstrated a maximum PCE of 12.58% under the same conditions. The PY2 and PY3 materials demonstrated slightly lower performance in device configuration, with relatively moderate PCEs of 10.21% and 10.82%, respectively, and slight hysteresis behavior (−0.01 and 0.02). The preliminary stability testing of PSCs is also described. The PY1-based device exhibited better stability than the device using Spiro-OMeTAD, which could be related to its slightly superior hydrophobic character preventing water diffusion into the perovskite layer.
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http://dx.doi.org/10.3390/ma15227992 | DOI Listing |
Am J Pharm Educ
September 2024
University of North Carolina at Chapel Hill, Well-being and Resiliency, Division of Practice Advancement and Clinical Education, UNC Eshelman School of Pharmacy, Chapel Hill, NC, USA. Electronic address:
Objective: Literature indicates concerning rates of burnout and declining well-being among students. Although well-being initiatives have increased, a gap exists in identifying factors that impact pharmacy student well-being. The purpose of this study was to explore the factors students perceive that influence their burnout and identify recommendations to improve student well-being.
View Article and Find Full Text PDFJ Colloid Interface Sci
September 2024
School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, PR China. Electronic address:
Am J Pharm Educ
January 2024
University at Buffalo, School of Pharmacy & Pharmaceutical Sciences, Buffalo, NY, USA. Electronic address:
Objective: Interprofessional education (IPE) varies across schools/colleges of pharmacy. Long-term impact of IPE on interprofessional collaborative competencies remains uncertain despite available data on singular experiences. This study aimed to evaluate changes in pharmacy students' collaborative abilities over the second and third professional years (PYs).
View Article and Find Full Text PDFAm J Pharm Educ
January 2024
University of South Florida Morsani College of Medicine (USF-MCOM), Tampa Campus, Tampa, FL, USA.
Objective: This is a final analysis of longitudinal evaluation of burnout and empathy among a cohort of Doctor of Pharmacy students throughout their 4-year enrollment.
Methods: The class of 2021 received sequential Qualtrics (Qualtrics, Provo, UT) surveys containing 2 validated survey instruments, the Jefferson Scale of Empathy and the Maslach Burnout Inventory. Surveys were disseminated at the start of the program (PY1) and the end of each academic year (PY1, PY2, PY3, PY4).
Angew Chem Int Ed Engl
July 2023
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.
The central core in A-DA D-A-type small-molecule acceptor (SMAs) plays an important role in determining the efficiency of organic solar cells (OSCs), while the principles governing the efficient design of SMAs remain elusive. Herein, we developed a series of SMAs with pyrido[2,3-b]quinoxaline (PyQx) as new electron-deficient unit by combining with the cascade-chlorination strategy, namely Py1, Py2, Py3, Py4 and Py5. The introduction of chlorine atoms reduces the intramolecular charge transfer effects but elevates the LUMO values.
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