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Defects engineering for high-performance perovskite solar cells

npj Flexible Electronics 2018年第1期2卷 175-188页

作者： Feng Wang Sai Bai Wolfgang Tress Anders Hagfeldt Feng Gao Department of Physics Chemistry and Biology(IFM)Linkoping UniversityLinköping SE-58183Sweden laboratory of photomolecular science(LSPM) École Polytechnique Fédérale de Lausanne(EPFL)1015 LausanneSwitzerland

Metal halide perovskites have achieved great success in photovoltaic applications during the last few *** solar to electrical power conversion efficiency(PCE)of perovskite solar cells has been rapidly improved from 3.9%to certified 22.7%due to the extensive efforts on film deposition methods,composition and device *** investigation on eliminating the defect states in perovskite absorbers is necessary to push forward the PCE of perovskite solar cells approaching the Shockley-Queisser *** this review,we summarize the defect properties in perovskite films and present methodologies to control the defects density,including the growth of large size crystals,photo-curing method,grain boundary and surface passivation,and modification of the *** also discuss the defects-related stability and hysteresis issues and highlight the current challenges and opportunities in defects control of perovskite films.

关键词： perovskite absorber approaching

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Chemically tailored molecular surface modifiers for efficient and stable perovskite photovoltaics

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SmartMat 2021年第1期2卷 33-37页

作者： Yuhang Liu Bitao Dong Anders Hagfeldt Jingshan Luo Michael Graetzel laboratory of Photonics and Interfaces École Polytechnique Fédérale de LausanneLausanneSwitzerland laboratory of photomolecular science École Polytechnique Fédérale de LausanneLausanneSwitzerland Institute of Photoelectronic Thin Film Devices and Technology Solar Energy Research CenterKey Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinMinistry of Education Engineering Research Center of Thin Film Photoelectronic TechnologyRenewable Energy Conversion and Storage CenterNankai UniversityTianjinChina

Perovskite solar cells(PSCs)have attracted intense attention based on their high power conversion efficiency and low production ***,due to the polycrystalline nature and the intrinsic hydrophilicity of the metal halide perovskite moieties,the photovoltaic performance of PSCs is largely limited by defects within the polycrystalline perovskites and the sensitivity to *** this perspective,we focus on the chemically tailored interface materials to passivate the defects and improve the moisture stability of ***,we provide a brief overview of various molecular interface *** we provide examples from our recent work on organic ammonium halide‐based passivation materials as representatives to illustrate the design strategies and the modification *** the end,we shed light on the future devel-opment of organic ammonium halides for applications in PSCs.

关键词： organic ammonium halide perovskite solar cell surface modification

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Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology

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Journal of Energy Chemistry 2020年第7期29卷 8-15,I0001页

作者： Xiaojing Wan Ze Yu Wenming Tian Fuzhi Huang Shengye Jin Xichuan Yang Yi-Bing Cheng Anders Hagfeldt Licheng Sun State Key laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesInstitute of Energy Science and TechnologyDalian University of Technology(DUT)Dalian 116024LiaoningChina State Key laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyLuoshi RoadWuhan 430070HubeiChina The Australian Centre for Advanced Photovoltaics(ACAP) Monash UniversityVictoria 3800Australia laboratory of photomolecular science Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of TechnologyStockholm 10044

All-inorganic cesium lead bromide(CsPbBr3)perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb ***,the fabrication of high-quality CsPbBr3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common ***,we report a facile solution-processed approach to prepare high-quality CsPbBr3 perovskite films via a two-step spin-coating method,in which the Cs Br methanol/H2 O mixed solvent solution is spin-coated onto the lead bromide films,followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film *** this fashion,dense and uniform CsPbBr3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect *** effectiveness of the resulting CsPbBr3 films is further examined in perovskite solar cells(PSCs)with a simplified planar architecture of fluorine–doped tin oxide/compact Ti O2/CsPbBr3/carbon,which deliver a maximum power conversion efficiency of 8.11%together with excellent thermal and humidity *** present work offers a simple and effective strategy in fabrication of high-quality CsPbBr3 films for efficient and stable PSCs as well as other optoelectronic devices.

关键词： All-inorganic perovskite solar cells CsPbBr3 Morphology control Solution-processed Stability

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Europium-Doped CsPbI2Br for Stable and Highly Efficient Inorganic Perovskite Solar Cells

Europium-Doped CsPbI2Br for Stable and Highly Efficient Inor...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Wanchun Xiang Zaiwei Wang Anders Hagfeldt State Key laboratory of Silicate Materials for Architectures Wuhan University of Technology laboratory of photomolecular science Institute of Chemical Sciences EngineeringEcole Polytechnique Fed rale de ausanne (EPF)

All-inorganic perovskite films hold promise for improving stability of perovskite solar cells(PSCs). However, the 3D α-phase of narrow band gap inorganic perovskites is thermodynamically unstable at room temperature, limiting the development of high performance inorganic PSCs . Here, we show that europium doping of CsPbIBr stabilizes the α-phase of inorganic perovskite at room temperature. We rationalize it by using solid-state nuclear magnetic resonance and high-angle annular dark-field scanning transmission electron microscopy, which show that europium is incorporated as B cation into the perovskite lattice. We demonstrate a maximum power-conversion efficiency of 13.71% for an inorganic PSC with the CsPbEuIBr perovskite and a stable power output of 13.34%. Using electroluminescence we show that incorporation of europium reduces non-radiative recombination by eliminating tail states, resulting in high open-circuit voltage of 1.27 V. The devices retain 93% of the initial efficiency after 370 hours under 100 mW·cm continuous white light illumination under maximum power point tracking measurement.

关键词： Inorganic perovskite solar cell open circuit voltage

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Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics

Nanoscale interfacial engineering enables highly stable and ...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Anurag Krishna Hong Zhang Zhiwen Zhou Thibaut Gallet Mathias Dankl Olivier Ouellette Felix T.Eickemeyer Fan Fu Mounir Mensi Shaik M.Zakeeruddin Ursula Rothlisberger G.N.Manjunatha Reddy Alex Redinger Michael Gr?tzel Anders Hagfeldt laboratory of photomolecular science Institute of Chemical Sciences and Engineeringécole Polytechnique Fédérale de Lausanne laboratory of Photonics and Interfaces école Polytechnique Fédérale de Lausanne

Long-term operational stability remains the primary concern for perovskite solar cells. Consequently, there is a quest for searching for new compositions that enable stable and efficient perovskites. We report a new molecular-level interface engineering strategy using a multifunctional ligand that augments long-term operational and thermal stability by chemically modifying the formamidinium lead iodide rich photoactive layer. The surface derivatized solar cells exhibited high operational stability(maximum powering point tracking at 1 sun) with a stabilized T80(the time over which the device efficiency reduces to 80% of its initial value of post-burn-in) of ≈5950 h at 40 oC and stabilized efficiency over 23%. The origin of high device stability and performance is correlated to the nano/subnanoscale molecular level interactions between ligand and perovskite layer, which is corroborated by comprehensive multiscale characterization. Our results provide key insights into the modulation of the grain boundaries, local density of states, surface bandgap, and interfacial recombination. Chemical analysis of the aged devices showed that interface passivation inhibited ion migration and prevented photoinduced I2 release that irreversibly degrades the perovskite. This study shows that passivating ligands have the potential to overcome stability issues associated with the high performing hybrid perovskite compositions, thus allowing a step closer to achieving long-standing stability of perovskitebased solar cells.

关键词： perovskite solar cells supramolecular chemistry molecular passivation grain boundaries defects operational stability

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Intermediate phase enhances inorganic perovskite and metal oxide interface for efficient photovoltaics

Intermediate phase enhances inorganic perovskite and metal o...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Jiahuan Zhang Zaiwei Wang Wanlin Guo Anders Hagfeldt Key laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control for Mechanical StructuresInstitute of Nanoscience of Nanjing University of Aeronautics and Astronautics laboratory of photomolecular science Institute of Chemical Sciences EngineeringEcole Polytechnique Fedérale de Lausanne(EPFL)

Interfacial modification is crucial to fully develop the potential of semiconductor devices,including the revolutionary halide perovskite-based optoelectronics,such as photovoltaics,light-emitting diodes,and *** all-inorganic halide perovskites,potential long-term stable photovoltaic materials,are suffering from poor interfacial contact with metal oxide charge selective layer,severely limiting the power conversion efficiency and stability of inorganic perovskite solar ***,we proposed an intermediate phase engineering strategy to improve the inorganic perovskite/metal oxide interface by utilizing volatile *** introduction of organic cations(such as methylammonium and formamidinium) which can be doped into the perovskite lattice leads to the formation of an organic-inorganic hybrid perovskite intermediate phase,promoting a robust interfacial contact through hydrogen bonding.A champion CsPb(IBr)-based device with a power conversion efficiency of 17.0% and an open-circuit voltage of 1.34 V was realized,implying that a record of over 65% of the Shockley-Queisser efficiency limit is achieved.

关键词： Intermediate phase interfacial contact inorganic perovskite solar cells

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