Author: Trong Tam Nguyen

Webinar: Optical Integrated Perovskite to Silicon for Enhanced Performance

Posted on by Trong Tam Nguyen

Title | Optical Integrated Perovskite to Silicon for Enhanced Performance

Date | Tuesday, June 4, 2024, at 9:30 a.m. (UTC +2)

Speaker | Prof. Baoquan Sun (Soochow University, China)

Abstract | Lead-free halide double perovskites, have not been deemed useful thus far due to the absence of high photoluminescence quantum yield (PLQY) examples and large bandgaps. Herein, we demonstrate the doping strategy for the benchmark material of Cs2NaInCl6, achieving blue emission with near-unity PLQY and the lowest bandgap of 1.24 eV. In addition, we would like to discuss some strategies to mitigate parasitic absorption of silicon solar integrated with luminescent converter issues. We showed that part of short wavelength sunlight can be converted into a polarization electrical field by perovskite particles, which strengthens asymmetry in heterojunction solar cells through the molecule alignment process. Then, incorporating luminescent perovskite and quantum dots with high quantum yields as light converters can also enhance power conversion efficiency.

 

Références :

[1]      Liu, Yan; Dai, Xing; Zeng, Xuelian; Yuan, Xianrong; Wang, Yanan; Song, Yuhang; Chen, Haoyu; Zhang, Chao; Wang, Yong; Wan, Li; Zou, Yatao; Ning, Weihua; Sun, Baoquan, High-Efficient Blue Emission and Bandgap Engineering from Jahn–Teller Distorted Halide Double Perovskites. Advanced Optical Materials 2024, 12 (3), 2301576.
[2]      Jiang C.; Zhang G.; Hong Z.; Chen J.; Li Y.; Yuan X.; Lin Y.; Yu C.; Wang T.; Song T.; Wang Y.; Sun B., Colored Silicon Heterojunction Solar Cells Exceeding 23.5% Efficiency Enabled by Luminescent Down-Shift Quantum Dots. Advanced Material 2023, 35 (6), e2208042.

Workshop: Renewable energy and emerging technologies

Posted on by Trong Tam Nguyen

Title | Renewable energy and emerging technologies

Date | Tuesday June 4 , 2024

Place | ESPCI Paris + hybrid mode by ZOOM

Organizer | Dr Zhuyoing Chen (CNRS/ESPCI)

Program |

09h20 – 09h30 Opening
09h30 – 10h10 Baoquan Sun (Soochow University)
Optical Integrated Perovskite to Silicon for Enhanced Performance
10h10 – 10h50 Emmanuelle Deleporte (ENS Paris Saclay)
2D/3D hybrid halide perovskite heterostructures for stable and high-efficiency solar cells
10h50 – 11h10 Coffee break
11h10 – 11h50 Thierry Pauporté (IRCP)
Chemical changes occurring upon the synthesis of 2D to 3D organometal perovskite layers
11h50 – 14h00 Poster & lunch
14h00 – 14h40 Annie Colin (ESPCI)
Harvest osmotic energy from the difference in salinity between salt water (sea, lake) and fresh water (river, treated water)
14h40 – 15h20 Ruiyuan Liu (Soochow University)
Flexible ambient-energy harvesters and self-powered sensors
15h20 – 15h35 Coffee break
15h35 – 16h15 Beibei Shao (Soochow University)
High-Efficient Hydrovoltaic and Triboelectric Power Generators for
Wearable/On-skin Electronics
16h15 – 16h55 Jean-François Guillemoles (IPVF)
Photoluminescence and reliability in perovskite solar cells
16h55 – 17h00 Closing

Synergetic Exterior and Interfacial Approaches by Colloidal Carbon Quantum Dots for More Stable Perovskite Solar Cells Against UV

Posted on by Trong Tam Nguyen

Contribution: LPEM

Reference : Small. 2024, 2401505, https://doi.org/10.1002/smll.202401505 (Early view)

DOI : https://doi.org/10.1002/smll.202401505

Contacts : zhuoying.chen@espci.fr

 

Abstract :

The achievement of both efficiency and stability in perovskite solar cells (PSCs) remains a challenging and actively researched topic. In particular, among different environmental factors, ultraviolet (UV) photons play a pivotal role contributing to device degradation. In this work, by harvesting simultaneously both the optical and the structural properties of bottom-up-synthesized colloidal carbon quantum dots (CQDs), we provide a cost-effective means to circumvent the UV-induced degradation in PSCs without scarification on their power conversion efficiencies (PCEs). By exploring and optimizing the amount of CQDs and the different location/interfaces of the solar cells where CQDs are applied, we achieve a synergetic configuration where the photovoltaic performance drop due to optical loss is completely compensated by the increased perovskite crystallinity due to interfacial modification. As a result, on the optimized configurations where CQDs were applied both on the exterior front side as an optical layer and at the interface between the electron transport layer and the perovskite absorber, unencapsulated PSCs with PCEs > 20% are fabricated which can maintain up to ~ 94% of their initial PCE after 100 hours of degradation in ambient air under continuous UV illumination (5 mW cm-2).

 

Left : Schematic illustrating the combined exterior and interfacial application of bottom-up synthesized carbon quantum dots (CQDs) in a functional PSC structure. Right : Unencapsulated PSC stability under continuous UV illumination measured on devices without (control) and with CQDs applied under different configurations in air. This work highlights a cost-effective means based on CQDs to circumvent the UV-induced degradation in efficient perovskite solar cells (PSCs) without scarification on their power conversion efficiencies.