ORCID Profile
0000-0002-6646-9851
Current Organisation
University of Newcastle Australia
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Publisher: MDPI AG
Date: 10-11-2022
DOI: 10.3390/EN15228393
Abstract: The solar simulator has allowed all photovoltaic devices to be developed and tested under laboratory conditions. Filtered xenon arc l s were the gold-standard source for solar simulation of small-area silicon photovoltaic devices however, scaling these devices to illuminate large areas is neither efficient nor practical. Large-area solar simulation to meet appropriate spectral content and spatial nonuniformity of irradiance (SNI) standards has traditionally been difficult and expensive to achieve, partly due to the light sources employed. LED-based solar simulation allows a better electrical efficiency and uniformity of irradiance while meeting spectral intensity requirements with better form factors. This work details the design based on optical modeling of a scalable, large-area, LED-based, solar simulator meeting Class AAA performance standards formed for inline testing of printed solar cells. The modular design approach employed enables the illuminated area to be expanded in quanta of ~260 cm2 to any preferred illumination area. A 640 cm2 area illuminated by two adjacent PCB units has a measured total emission of 100 mW/cm2, with a SNI of 1.7% and an excellent approximation to the AM1.5G spectrum over the wavelength range of 350–1100 nm. The measured long-term temporal instability of irradiance (TIE) is .5% for a 550-min continuous run. This work identifies the design steps and details the development and measurement of a scalable large-area LED-based solar simulator of interest to the PV testing community, and others using solar simulators.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA04191D
Abstract: The synthesis and performance of a cost-effective mixed fullerene at the 100+ g scale with a reaction yield of 85% is demonstrated.
Publisher: Springer Science and Business Media LLC
Date: 31-05-2013
Publisher: Pleiades Publishing Ltd
Date: 08-2012
Publisher: Springer Science and Business Media LLC
Date: 28-04-2018
Publisher: Springer Science and Business Media LLC
Date: 22-10-2015
Publisher: Springer Science and Business Media LLC
Date: 15-07-2015
Publisher: Wiley
Date: 26-09-2018
DOI: 10.1002/PIP.3072
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 12-2013
Publisher: Canadian Science Publishing
Date: 12-2011
DOI: 10.1139/P11-118
Publisher: MDPI AG
Date: 29-07-2022
Abstract: The performance of the electron transport layer (ETL) plays a critical role in extending the operational lifespan of organic photovoltaic devices. ZnO is an excellent electron transport layer used in the printable organic photovoltaic cells. A comparison of Ca and ZnO as the ETL in encapsulated bulk heterojunction OPV devices has been undertaken with the device stability dependence on light soaking, temperature, irradiance, and thermal cycling recorded. It was observed that the OPV devices using Ca ETL decayed faster than the ZnO ETL devices under the same light illumination. The degradation in a Ca ETL device is ascribed to the formation of an insulating calcium oxide layer at the ETL interfaces. Photoluminescence (PL) spectroscopy revealed a higher PL signal for the degraded Ca ETL devices compared to the ZnO ETL devices. Power conversion efficiency (PCE) of the ZnO ETL devices was found to be much more stable than the Ca devices. The PCE for ZnO ETL devices still retained 40% of their initial value while the Ca ETL devices failed completely over the period of 18 days in the study, leading to a clear outcome of the study.
Publisher: American Chemical Society (ACS)
Date: 19-02-2019
Abstract: Deposition of functionalized nanoparticles onto solid surfaces has created a new revolution in electronic devices. Surface adsorbates such as ionic surfactants or additives are often used to stabilize such nanoparticle suspensions however, little is presently known about the influence of such surfactants and additives on specific electronic and chemical functionality of nanoparticulate electronic devices. This work combines experimental measurements and theoretical models to probe the role of an ionic surfactant in the fundamental physical chemistry and electronic charge carrier behavior of photodiode devices prepared using multicomponent organic electronic nanoparticles. A large capacitance was detected, which could be subsequently manipulated using the external stimuli of light, temperature, and electric fields. It was demonstrated that analyzing this capacitance through the framework of classical semiconductor analysis produced substantially misleading information on the electronic trap density of the nanoparticles. Electrochemical impedance measurements demonstrated that it is actually the stabilizing surfactant that creates capacitance through two distinct mechanisms, each of which influenced charge carrier behavior differently. The first mechanism involved a dipole layer created at the contact interfaces by mobile ions, a mechanism that could be replicated by addition of ions to solution-cast devices and was shown to be the major origin of restricted electronic performance. The second mechanism consisted of immobile ionic shells around in idual nanoparticles and was shown to have a minor impact on device performance as it could be removed upon addition of electronic charge in the photodiodes through either illumination or external bias. The results confirmed that the surfactant ions do not create a significantly increased level of charge carrier traps as has been previously suspected, but rather, preventing the diffusion of mobile ions through the nanoparticulate film and their accumulation at contacts is critical to optimize the performance.
Publisher: Springer Science and Business Media LLC
Date: 05-11-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9SE01149H
Abstract: A systematic approach for assessing organic photovoltaic (OPV) materials for large scale production based on the efficiency, lifetime and material cost has been developed. A Ω of 2.55 results in the following maximum material cost.
Publisher: Elsevier BV
Date: 11-2011
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3653643
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 07-2012
No related grants have been discovered for Alaa Al-Ahmad.