New LED & solar cell research papers in 2023. Our latest blog and upcoming conference.
/In our last newsletter, we announced Setfos 5.3 and we are pleased to see how many of our customers have already upgraded to the latest version. New products and updates are really only viable if they boost the R&D of researchers.
How do we measure this? We check the number of research papers that have been published with the support of our tools. The start of 2023 is continuing the upward trend from last year. We are especially pleased to see research enabled by our new tools, Litos and Litos Lite. You can read our favorites here.
In addition, we are pleased to highlight our latest blog post entitled "PEROVSKITE SOLAR CELL UPSCALING PREDICTION" where we detail how we used the upscaling simulation software Loass to optimize a perovskite photovoltaic minimodule.
As always, we look forward to attending upcoming conferences to share our research and connect with the research community. To find out where we will be this week, click here.
New Research Papers - Solar Cells and LEDs
Heteroleptic Ir(III)-based near-infrared organic light-emitting diodes with high radiance capacity
Yongjin Park, Gyeong Seok Lee, Woochan Lee, Seunghyup Yoo, Yun‑Hi Kim, Kyung‑Cheol Choi
Scientific Reports 13, 1369 (2023).
https://doi.org/10.1038/s41598-023-27487-6
Researchers from Kaist have developed new Ir(III)-based heteroleptic NIR materials for near-infrared organic light-emitting diodes (NIR OLEDs) with heavy metals. These materials have a highly oriented horizontal dipole ratio and short radiative lifetime. In NIR OLEDs, these emitters offer an extremely low turn-on voltage and high radiance capacity, making them suitable for various applications such as healthcare services, veil authentication, and night vision displays.
This study demonstrates exceptional device performance among similar Ir(III)-based NIR OLEDs, which makes it a promising material for commercial applications.
The emission layer was deposited on a bare 50 nm-thick glass substrate. A full angle-dependent p-polarized PL spectrum was collected with Phelos, our Gonio-Spectrometer for Angle-Dependent EL and PL Measurements.
Carlo Andrea Riccardo Perini, Esteban Rojas-Gatjens, Magdalena Ravello, Andrés-Felipe Castro-Mendez, Juanita Hidalgo, Yu An, Sanggyun Kim, Barry Lai, Ruipeng Li, Carlos Silva-Acuña, Juan-Pablo Correa-Baena
Adv. Mater. 34, 2204726 (2022)
https://doi.org/10.1002/adma.202204726
This study from our colleagues at the Energy Materials Lab at Georgia Tech, led by Prof. Juan-Pablo Correa-Baena investigates the impact of bulky-cation-modified interfaces on the stability of halide perovskite solar cells.
The interface layers used in state-of-the-art solar cells are thermally unstable. Changes in the chemical composition and structure of the films under thermal stress affect charge-carrier dynamics and device operation. The type of cation used for surface treatment also affects the extent of these changes, with long carbon chains providing more stable interfaces. This study emphasizes the importance of prolonged annealing of the treated interfaces to enable reliable performance reporting and inform the selection of different bulky cations.
The solar cells were characterized by using Litos Lite, equipped with a Wavelabs Sinus-70 AAA solar simulator. The Aging tests were performed using 1 Sun equivalent illumination with no UV-component, holding the substrates at 55 °C in an N2 atmosphere, and using an MPP tracking algorithm. Every 12 h, a J–V scan in reverse and forward direction was automatically acquired.
Yanyan Liu, Jiaji Yang, Zhu Mao, Dongyu Ma, Yuyuan Wang, Juan Zhao, Shi-Jian Su, Zhenguo Chi
Adv. Optical Mater. 2201695, 1 (2023)
https://onlinelibrary.wiley.com/doi/10.1002/adom.202201695
This paper from our customers at Sun Yat-sen University in China shows three new thermally-activated delayed fluorescence (TADF) molecules with different donor-acceptor (D-A) frameworks, namely D-A, D-A-D, and D-A-A. The TADF molecules were evaluated for their photophysical and electroluminescence properties.
The study found that the TADF molecule with the D-A-A framework achieved the best performance in terms of external quantum efficiency due to its low energy gap between singlet and triplet, effective reverse intersystem crossing, high photoluminescence quantum yield, and horizontal dipole ratio. This provides also insights into the design of efficient TADF emitters.
Andrés-Felipe Castro-Méndez, Jamie P. Wooding, Selma Fairach, Carlo A. R. Perini, Emily K. McGuinness, Jacob N. Vagott, Ruipeng Li, Sanggyun Kim, Vivek Brahmatewari, Nicholas Dentice, Mark D. Losego, and Juan-Pablo Correa-Baena
ACS Energy Lett. 8, 844 (2023)
https://doi.org/10.1021/acsenergylett.2c02272
Researchers at Georgia Tech show that vapor phase infiltration (VPI) is a suitable tool to create hybrid organic−inorganic layers that improve the stability of organic charge transport layers, such as hole-selective spiro-OMeTAD in PSCs and in other organic electronic devices. The infiltration of TiOx via VPI hinders the crystallization of the spiro-OMeTAD layer. The infiltrated PSCs retained over 80% of their original efficiency after a stability test of 200 hours at 75°C. This is two times the efficiency retained by solar cells without infiltration. This study suggests that VPI can be used to stabilize organic charge transport layers and prolong device lifetimes.
Device stability measurements were carried out by tracking the maximum power point (MPP) of the solar cells while keeping constant the temperature of the device at 75 °C. The team used the stability measurement platform Litos.
New Research Blog: PEROVSKITE SOLAR CELL UPSCALING PREDICTION
Check out our latest research blog to learn about how we utilized the simulation software Laoss to optimize a perovskite photovoltaic minimodule.
In a minimodule, the device's active area is divided into smaller cells with an interconnection gap. The narrower the subcell, the lower the resistance of each subcell with consequent improvement of the FF. However, the interconnecting gap between each subcell is an inactive area, that reduces the total efficiency of the module.
We used Laoss to optimize the geometry of a perovskite mini-module and to predict the device’s efficiency. Our simulation approach provides a more efficient method for upscaling perovskite solar cells than the traditional experimental trial-and-error method.
Upcoming Conferences & Workshops
STABLE HYBRID PEROVSKITE WORKSHOP - NANOGE 2023 (Hybrid Event)
The 1-day Workshop on Stable Hybrid Perovskite Materials for Photovoltaics Under Real-World Conditions will take place in Fribourg, Switzerland on Thursday 23rd of February 2023.
Address: Chem. des Verdiers 4, 1700 Fribourg, Switzerland
The aim of this workshop is to gather experts in the field of hybrid perovskites who have been leading the development of stable hybrid perovskites under real-world operating conditions and engage them in a discussion on the latest developments and future challenges. In addition, the workshop will provide a platform for the international attendees to interact and exchange about the research strategies and methodologies in the development of stable perovskite solar cells.
The number of attendees on-site is limited to 50 while other participants will attend online. Register for online attendance here.
Fluxim´s Dr. Antonio Cabas Vidani will be presenting an invited talk on:
Analysis of ionic charge carriers in FA-based perovskite and ageing of high-bandgap perovskite films and solar cells
16:00 - 16:30
Our colleague, Prof. Dr. Wolfgang Tress from ZHAW will be opening the workshop with an invited talk on:
Perovskite Solar Cells under Real-World Conditions
09:15 - 09:45
Download the program here
Our Latest Research Videos
Our researcher-level videos offer an exciting way to engage with the latest developments in PV and LEDs. Not only are they informative and insightful, but they also provide a more engaging experience than reading papers alone. There are over 50 videos to choose from covering conference talks, how to use our tools, and of course our new series “Fluxim’s Science Shorts” (Episode 5 will be with you very soon).
Join our community of researchers on Youtube by scanning the QR-Code (or simply click on it)
