Perovskite & Organic devices
Peking University, Beijing, China
Dr. Rui Zhu is a professor (tenured) at the Institute of Modern Optics, School of Physics, Peking University. He was selected as the "Boya Young Scholar" of Peking University. He has received “Excellent Young Scholar Award” from the National Natural Science Foundation of China in 2017 and “Distinguished Young Scholar Award” from the Beijing Natural Science Foundation in 2021. His research is focusing on the topics related to perovskite solar cells. He has authored more than 90 research papers, including Science, Nature Reviews Materials, Nature Photonics, Nature Energy, Nature Communications, Advanced Materials and Nano Letters with over 10000 citations (h-index: 43). He has received 14 authorized Chinese patents. Several papers have been selected as the "China's Top 100 Most Influential International Academic Papers”, the “Beijing Area Widely Concerned Academic Paper". He has 13 ESI highly cited papers and 2 ESI hot papers. He has won the 17th “Wang Daheng’s Optical Prize” for Young and Middle-Aged Scientists (2020), the 9th “Yau Yuk-Tai Fundamental Optics Award” (second class prize, 2016), the “Chen Huxiong’s Young Teacher Award, School of Physics, Peking University” (2017) and the “Excellent Doctoral Dissertation Supervisor award of Peking University” (2017).
Abstract for Presentation
The Critical Role of Organic Ammonium Halides in Perovskite Photovoltaics
In recent years, our research group keeps focusing on the development of highperformance metal halide perovskite solar cells (PSCs) including the screen of the related optoelectronic materials and the optimization of devices as well as the study of chemical and physical machnisim. Organic ammonium halides such as methylammonium halides, formamidinium halides, and other alkylammonium halides play a critical role in PSCs. On the one hand, they are the indispensable components to construct the 2D or 3D perovskite crystals and are vital to tune the bandgaps of the perovskites. On the other hand, they can be utilized as dopants or additives to improve the perovskite films, which mainly involves three aspects: (i) the optimization of onestep or two-step method perovskite precursor solution, (ii) the post-treatment of the perovskite film surface, and (iii) the modification of the buried interface. Especially after 2017, the second aspect, that is, using organic ammonium halides to post-treat the perovskite film is regarded as the most effective way to passivate the surface defects for highly-efficient PSCs, becoming more and more popular in the field of PSCs.
Our research group starts paying close attention to the study of improving PSCs using organic ammonium halides from 2015, and a series of good results have been achieved. For the (i) aspect, we developed some strategies such as (a) doping methylammonium bromide into the lead acetate-based perovskite precursor solution to modulate the crystallization, enhancing the optoelectronic properties of perovskite films, (b) adding guanidinium bromide into the all-inorganic perovskite precursor to induce spontaneous interfacial manipulation, optimizing the interfacial contact, and (c) introducing phenmethylammonium iodide into the organic salt solution for second step in the sequential deposition to realize the passivation of grain boundary and interface, leading to ultra-long carrier lifetimes exceeding 6 μs. For the (ii) aspect, we developed some strategies such as (a) post-treating the perovskite film using guanidinium bromide to form a graded junction at the surface region, achieving significantly enhanced photovoltage over 1.20 V, (b) polishing the perovskite surface with a phenmethylammonium iodide-containing chemical polishing agent to decouple the double-edged sword effect of excess PbI2, realizing improved photovoltaic performances and device stability. For the (iii) aspect, utilizing phenethylammonium bromide to treat the organic hole transport layer and construct 2D perovskite at the buried interface, remarkably increasing the performances of tin-based PSCs. To further study the buried clearly and directly, we then developed a characterizing platform for the buried interface for the first time, and found surface post-treatment could lead to the molecule-assisted microstructural reconstruction and simultaneously optimize the buried interface. Inspired by the interest new results in this work, we began to realize that the modification of the buried interface is of equal importance to the surface modification. Then we developed a depth-dependent defect manipulation strategy using a binary modulator system with selective penetrability within polycrystalline perovskite films, which can concurrently passivate the defects both in bulk and at interfaces to boost the performances of PSCs.
 L. Zhao # , D. Luo # , J. Wu, Q. Hu, W. Zhang, K. Chen, T. Liu, Y. Liu, Y. Zhang, F. Liu, T.P. Russell*, H.J. Snaith, R. Zhu*, Q. Gong, Adv. Funct. Mater., 26 (2016) 3508.
 Y. Zheng, X. Yang, R. Su, P. Wu, Q. Gong, R. Zhu*, Adv. Funct. Mater., 30 (2020) 2000457.
 X. Yang # , Y. Fu # , R. Su, Y. Zheng, Y. Zhang, W. Yang, M. Yu, P. Chen, Y. Wang, J. Wu, D. Luo, Y. Tu, L. Zhao*, Q. Gong, R. Zhu*, Adv. Mater., 32 (2020) 2002585.
 D. Luo # , W. Yang # , Z. Wang # , A. Sadhanala, Q. Hu, R. Su, R. Shivanna, G.F. Trindade, J.F. Watts, Z. Xu, T. Liu, K. Chen, F. Ye, P. Wu, L. Zhao, J. Wu, Y. Tu, Y. Zhang, X. Yang, W. Zhang*, R.H. Friend, Q. Gong, H.J. Snaith*, R. Zhu*, Science, 360 (2018) 1442.
 D. Luo # , R. Su # , W. Zhang*, Q. Gong, R. Zhu*, Nat. Rev. Mater., 5 (2020) 44.
 K. Chen # , P. Wu # , W. Yang, R. Su, D. Luo, X. Yang, Y. Tu, R. Zhu*, Q. Gong, Nano Energy, 49 (2018) 411.
 X. Yang # , D. Luo # , Y. Xiang # , L. Zhao, M. Anaya, Y. Shen, J. Wu, W. Yang, Y. -H. Chiang, Y. Tu, R. Su, Q. Hu, H. Yu, G. Shao, W. Huang, T.P. Russell, Q. Gong*, S.D. Stranks, W. Zhang*, R. Zhu*, Adv. Mater., 33 (2021) 2006435.
 Y. Zhang # , Y. Wang # , L. Zhao*, X. Yang, C.-H. Hou*, J. Wu, R. Su, S. Jia, J.-J. Shyue, D. Luo, P. Chen, M. Yu, Q. Li, L. Li, Q. Gong, R. Zhu*, Energy Environ. Sci., 14 (2021) 6526.
 L. Zhao # , Q. Li # , C.-H. Hou, S. Li, X. Yang, J. Wu, S. Zhang, Q. Hu, Y. Wang, Y. Zhang, Y. Jiang, S. Jia, J.-J. Shyue, T.P. Russell, Q. Gong, X. Hu, R. Zhu*, J. Am. Chem. Soc., 144 (2022) 1700.
WELCOME TO CHINA TO ATTEND THE ICANS
23-26 August, Nanjing, China
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