Toward materials, interface engineering and charge transport properties of perovskite solar cells
Institute of Physics, Chinese Academy of Sciences
Abstract: Perovskite-based solar cells (PSCs) has attracted worldwide interest due to their dramatic increase in the power conversion efficiency (PCE). Currently, several kinds of perovskite solar cells have been developing, such as planar heterojunction and mesoporous structures. No matter what kind of PSCs, materials and interfacials are crucial to the improvement of the cell performance and stability. Aiming at these issues, some representative works have been carried out in our labs and 21% PCE has been achieved [1-9]. By introducing an ultrathin Al2O3 layer from atomic layer deposition technique (ALD) as metal-insulator-semiconductor (MIS) back contact between the perovskite and the metal electrode, the short circuit current and the power conversion efficiency have been significantly improved. The perovskite absorber layer fabrication methods and new hole transportation materials with better stability as the alternatives of spiro-OMeTAD have been designed and investigated. Furthermore, an electrically modulated transient photocurrent/photovoltage technology has been developed for investigating the slow charge and electric field response inside the PSC (see Figure 1) . The intrinsic hysteresis behavior has been investigated, which was mainly caused by the ion migration in the perovskite absorber drifted by multiple electric fields derived from heterojunction depletion charge, external modulation and the ion charge itself.
Biography: Qingbo Meng is a full professor at Institute of Physics (IOP), Chinese Academy of Sciences (CAS), and Director of Center for Clean Energy, IOP. He received his PhD from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences in 1997. In 1997-1999, he was a postdoctoral fellow in IOP, CAS. From 1999 to 2002, he was a STA Fellow (Science and Technology Agency of Japan) and Researcher of the University of Tokyo and KAST in Japan. He was selected as “Hundreds of Talents of CAS” in 2001, “Distinguished Young Scholars” from NSFC in 2007 and "hundreds of leading talent of Beijing Science and Technology" in 2013. His main research interest focuses on solar energy materials and devices, including the design, controlled synthesis, characterization of key materials for the low price nanocrystalline sensitized solar cells (DSCs and QSCs) and perovskite solar cells, and research of the dynamics of electron injection, diffusion, recombination in the SCs. He has published over 200 papers which were cited over 7000 times (h-index 51). He has applied over 80 patents, and over 50 patents were authorized. In 2005, he was awarded excellent award for “Hundreds of Talents” of CAS, in 2007, he was awarded National Science Fund for Distinguished Young Scholars, in 2011, he obtained Tokyo University of Science President Award. He is now the member of Editorial Board for Electrochem. Commun. and Funding editor for Green “The International Journal of Sustainable Energy Conversion and Storage”, and the director member of Chinese Renewable Energy Society.