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A red emitting perovskite LEDs

Dr zhongcheng yuan

Marie Curie Fellow (UKRI Guarantee)

Research theme

  • Photovoltaics and nanoscience

Sub department

  • Condensed Matter Physics

Research groups

  • Snaith group
zhongcheng.yuan@physics.ox.ac.uk
Robert Hooke Building, room G29
  • About
  • Publications

Influence of Interfacial Reactions on Perovskite Optoelectronic Devices

small methods Wiley (2025) 2500438

Authors:

Zhongcheng Yuan, Sai Bai, Feng Gao, Henry J Snaith

Abstract:

Interfacial materials tend to alter the crystallization, films growth and defect formation process of the as‐deposited perovskites, which has been a critical and fundamental factor in determining the efficiency and operational stability of perovskite‐based optoelectronic devices. This review explores the underlying mechanism of interfacial reactions, which can either result in degradations or be beneficial. The influence of interfacial reactions, mainly interface‐induced deprotonation of organic cations and amidation processes, are discussed in relation to their impact on perovskite film growth and ensuing optoelectronic device performance. It is further proposed strategies to regulate these reactions and mitigate their negative effects to achieve high performance optoelectronic devices.
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Steering perovskite precursor solutions for multijunction photovoltaics

Nature Nature Research (2024)

Authors:

Shuaifeng Hu, Junke Wang, Pei Zhao, Jorge Pascual, Jianan Wang, Florine Rombach, Akash Dasgupta, Wentao Liu, Minh Anh Truong, He Zhu, Manuel Kober-Czerny, James N Drysdale, Joel A Smith, Zhongcheng Yuan, Guus JW Aalbers, Nick RM Schipper, Jin Yao, Kyohei Nakano, Silver-Hamill Turren-Cruz, André Dallmann, M Greyson Christoforo, James M Ball, David P McMeekin, Karl-Augustin Zaininger, Zonghao Liu, Nakita K Noel, Keisuke Tajima, Wei Chen, Masahiro Ehara, René AJ Janssen, Atsushi Wakamiya, Henry J Snaith

Abstract:

Multijunction photovoltaics (PVs) are gaining prominence owing to their superior capability of achieving power conversion efficiencies (PCEs) beyond the radiative limit of single-junction cells<sup>1-8</sup>, where improving narrow bandgap tin-lead perovskites is critical for thin-film devices<sup>9</sup>. With a focus on understanding the chemistry of tin-lead perovskite precursor solutions, we herein find that Sn(II) species dominate interactions with precursors and additives and uncover the exclusive role of carboxylic acid in regulating solution colloidal properties and film crystallisation, and ammonium in improving film optoelectronic properties. Materials that combine these two function groups, amino acid salts, considerably improve the semiconducting quality and homogeneity of perovskite films, surpassing the effect of the individual functional groups when introduced as part of separate molecules. Our enhanced tin-lead perovskite layer allows us to fabricate solar cells with PCEs of 23.9, 29.7 (certified 29.26%), and 28.7% for single-, double-, and triple-junction devices, respectively. Our 1-cm<sup>2</sup> triple-junction devices show PCEs of 28.4% (certified 27.28%). Encapsulated triple-junction cells maintain 80% of their initial efficiencies after 860 h maximum power point tracking in ambient. We further fabricate quadruple-junction devices and obtain PCEs of 27.9% with the highest open-circuit voltage of 4.94 V. This work establishes a new benchmark for multijunction PVs.
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Applications of Perovskite Light-Emitting Diodes

Fundacio Scito (2024)

Authors:

Zhongcheng Yuan, Chunxiong Bao, Henry Snaith, Feng Gao
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Interfacial reactions facilitated high performance perovskite LEDs and multifunctional displays

Fundacio Scito (2024)

Authors:

Zhongcheng Yuan, Chunxiong Bao, Sai Bai, Feng Gao
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A multifunctional display based on photo-responsive perovskite light-emitting diodes

Nature Electronics Nature Research 7:5 (2024) 375-382

Authors:

Chunxiong Bao, Zhongcheng Yuan, Wenxiao Niu, Jie Yang, Zijian Wang, Tao Yu, Jianpu Wang, Feng Gao

Abstract:

Current display screens are typically only used for information display, but can have a range of different sensors integrated into them for functions such as touch control, ambient light sensing and fingerprint sensing. Photo-responsive light-emitting diodes (LEDs), which can display information and respond to light excitation, could be used to develop future ultra-thin and large screen-to-body ratio screens. However, photo-response is difficult to achieve with conventional display technologies. Here, we report a multifunctional display that uses photo-responsive metal halide perovskite LEDs as pixels. The perovskite LED display can be simultaneously used as a touch screen, ambient light sensor and image sensor (including for fingerprint drawing) without integrating any additional sensors. The light-to-electricity conversion efficiency of the pixels also allow the display to act as a photovoltaic device that can charge the equipment.
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