02 Jan 12:23
by Bing‐Huang Jiang,
Zhen‐Jie Gao,
Chien‐Yu Lung,
Zhong‐En Shi,
He‐Yun Du,
Yu‐Wei Su,
Hui‐Shan Shih,
Kun‐Mu Lee,
Hsin‐Huai Hung,
Choon Kit Chan,
Chih‐Ping Chen,
Ken‐Tsung Wong
Remarkable results are attained in indoor Perovskite Solar Cells, achieving an impressive efficiency of 39.9% (3000K LED (1000 lux)) through the application of an A–D–A-type molecule for defect passivation within the electron transport layer.
Abstract
The passivation of perovskite interfacial defects by the electron transport layer (ETL) has emerged as an effective strategy for enhancing the performance of perovskite solar cells (PSCs). Dithieno[2,3-d:2′,3′-d′]thieno[3,2-b:3′,2′-b′]dipyrrole (DTPT)-based acceptor-donor-acceptor (A–D–A) molecules composed of coplanar heteroacene as electron-donating core end-capped with various electron-accepting moieties are designed and examined as ETL modifiers for PSCs. Employing PCBM:DTPTCY as the ETL results in passivation perovskite defects, facilitation energy alignment at the ETL/perovskite interface, and enhancement of carrier transport efficiency. The optimized blended ETL-based Cs0.18FA0.82Pb(I0.8Br0.2)3 p-i-n PSC exhibit performances of 37.2% and 39.9% under TL84 and 3000K LED (1000 lux), respectively. The DTPTCY-based device demonstrates remarkable stability, retaining 87% of its initial power conversion efficiency (PCE) after 30 days of storage in a 40% relative humidity (RH) ambient air environment without any encapsulation, surpassing the control device, which retains only 67% of its original PCE. These findings underscore the potential of A–D–A-type molecule-based interface modification to enhance passivation and contact properties, ultimately leading to high-efficiency and stable PSCs.
27 Dec 03:21
by Rui Chen,
Wenjun Zhang,
Xinyu Guan,
Hasan Raza,
Shasha Zhang,
Yiqiang Zhang,
Pavel A. Troshin,
Sergei A. Kuklin,
Zonghao Liu,
Wei Chen
Advanced Functional Materials, Volume 33, Issue 52, December 22, 2023.
27 Dec 03:17
by Alexandra J. Ramadan,
Woo Hyeon Jeong,
Robert D. J. Oliver,
Junke Jiang,
Akash Dasgupta,
Zhongcheng Yuan,
Joel Smith,
Jae Eun Lee,
Silvia G. Motti,
Olivia Gough,
Zhenlong Li,
Laura M. Herz,
Michael B. Johnston,
Hyosung Choi,
Jacky Even,
Claudine Katan,
Bo Ram Lee,
Henry J. Snaith
Quasi-2D perovskite structures are attractive for use in light-emitting diodes (LEDs) due to their high electroluminescence efficiency and narrow, tunable emission spectra. While an organic cation is required to induce a quasi-2D structure and promote light emission, care must be taken to minimize crystalline 2D structures which can act as electron injection barriers and ultimately reduce LED performance.
Abstract
Two dimensional/three-dimensional (2D/3D) metal halide perovskite heterostructures have attracted great interest in photovoltaic and light-emitting diode (LEDs) applications. In both, their implementation results in an improvement in device efficiency yet the understanding of these heterostructures remains incomplete. In this work the role of organic cations, essential for the formation of 2D perovskite structures is unraveled, in a range of metal halide perovskite heterostructures. These heterostructures are used to fabricate efficient green perovskite LEDs and a strong dependence between cation content and device performance is shown. The crystal structure, charge-carrier transport and dynamics, and the electronic structure of these heterostructures are studied and it is shown that the presence of crystalline 2D perovskite inhibits electron injection and ultimately lowers device performance. This work highlights the importance of optimizing the composition of these heterostructures in ensuring optimal device performance across all parameters and suggests that developing routes to inject charge-carriers directly into 2D perovskite structures will be important in ensuring the continued development of perovskite LEDs based on these heterostructures.
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
