Severity: Warning
Message: fopen(/var/lib/php/sessions/ci_sessionjg0edg4glrvso6843dooflke1lnsgkn9): Failed to open stream: No space left on device
Filename: drivers/Session_files_driver.php
Line Number: 177
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Severity: Warning
Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)
Filename: Session/Session.php
Line Number: 137
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
iScience
Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. Electronic address:
Published: April 2018
There is considerable interest in improving the performance of organic optoelectronic devices through processing techniques. Here, we study the effect of high-temperature annealing on the properties of the semiconducting polymer PTB7 and PTB7:fullerene blends, of interest as efficient organic photovoltaic (OPV) devices. Annealing to moderate temperature improves the PTB7 morphology and optoelectronic properties. High-temperature annealing also improves morphology but results in poorer optoelectronic properties. This is a result of side chain cleavage that creates by-products that act as trap states, increasing electronic disorder and decreasing mobility. We further observe changes to the PTB7 chemical structure after thermal cleavage that are similar to those following solar irradiation. This implies that side chain cleavage is an important mechanism in device photodegradation, which is a major "burn-in" loss mechanism in OPV. These results lend insight into side chain cleavage as a method of improving optoelectronic properties and suggest strategies for improvement in device photostability.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135925 | PMC |
http://dx.doi.org/10.1016/j.isci.2018.03.002 | DOI Listing |
ACS Appl Mater Interfaces
March 2025
School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
The photoelectronic properties and corresponding applications of halide perovskites significantly depend on their band gaps and formation energy. However, experiments and density functional theory (DFT) calculations are usually time consuming and laborious to obtain these properties. In this study, the formation energy, band gap, and band gap classification label of halide double perovskites were predicted in terms of material parameters via using the gradient boosting tree combined with the genetic algorithm and grid search algorithm.
View Article and Find Full Text PDFJ Phys Chem Lett
March 2025
State Key Laboratory of Quantum Optics Technologies and Devices, Shanxi University, Taiyuan, Shanxi 030006, China.
Metal halide perovskites are known to suffer from instability due to their high sensitivity to external stimuli. Although encapsulation can considerably improve their stability, the impact of encapsulation on the intrinsic photophysical properties of perovskites remains unclear. Here, we investigate the effect of hexagonal boron nitride (hBN) encapsulation on the photoluminescence (PL) dynamics of MAPbI perovskite crystals at the individual crystal level.
View Article and Find Full Text PDFNano Lett
March 2025
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
Optical detection and sensing have been widely applied to electrochemical systems, and their cutting-edge technology is creating current trends in operando characterization. The mass transfer at the electrode-electrolyte interface induces not only the electron exchange but also the changes in optical properties such as dielectric constants, resulting in detectable absorption or resonance signals. However, light-matter interactions are limited due to the inherently short optical path length of the interface.
View Article and Find Full Text PDFACS Biomater Sci Eng
March 2025
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Infected bone defects, caused by bacterial contamination following disease or injury, result in the partial loss or destruction of bone tissue. Traditional bone transplantation and other clinical approaches often fail to address the therapeutic complexities of these conditions effectively. In recent years, advanced biomaterials have attracted significant attention for their potential to enhance treatment outcomes.
View Article and Find Full Text PDFSci Adv
March 2025
School of Physics, The University of Sydney, NSW 2006, Australia.
Lead halide perovskites hold great promise for photovoltaics and optoelectronics, yet ion migration continues to challenge their long-term stability. Here, combining first-principles calculations and machine learning molecular dynamics, we unravel the interplay between perovskite octahedral lattice dynamics and energy barrier associated with ion migration. Our results show that B-site substitution, particularly with alkaline-earth and lanthanide elements, notably strengthens lattice interactions, restrains octahedral oscillation, and increases iodine-migration barriers, outperforming the commonly used A-site and X-site substitutions and interstitial doping.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.