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Ionic radius of interfacial molecular can affect the interface property and key electron transfer processes occurring at interface in polymer solar cells. To study the effects of different ionic radius of electron transfer layer on device performances, we introduce various stearate salts (Na + , K + and Cs + ) as electron transfer layer to fabricate polymer solar cells. Interestingly, it is found that the key device parameters such as V oc , J sc , fill factor and PCE of polymer solar cells present regular change with the ionic radius increasing. We systematically study the effects of different ionic radius of electron transfer layer on the various parameters of polymer solar cells and believe this regularity paves a way for further understanding and improving the performances of polymer solar cells. [ABSTRACT FROM AUTHOR]

Zinc oxide is an attractive material applied for electron-transporting interlayers of polymer solar cells. Some factors limited the efficiency and performance of the ZnO-based PSCs, such as the poor conductivity and the traps existing on ZnO film. Here, we introduce a novel approach to optimize the property of ZnO electron-transporting interlayers for the further improvement of device performance by doping bis (trifluoromethane)-sulfonimide lithium salt (Li-TFSI) in ZnO film. It is found that this way not only increased electrical conductivity and charge extraction ability of the electron-transporting interlayers but also reduced charge recombination occurred at interface that was very important for fill factor improvement. Therefore, an optimized power conversion efficiency (PCE) of 9.94% was achieved, which was observed with 13.2% enhancement (9.94% vs 8.78%) compared to that of pure ZnO-based ones. This indicates that doping Li-TFSI in ZnO film is a promising strategy to optimize the ZnO film and enhance the performance of regular polymer solar cells. [ABSTRACT FROM AUTHOR]

Inverted MAPbI3 Perovskite Solar Cells with Graphdiyne Derivative-Incorporated Electron Transport Layers Exceeding 20% Efficiency In article number 1900241, Tonggang Jiu and co-workers introduce chlorine-substituted graphdiyne into MAPbI SB 3 sb -based perovskite solar cells to produce a peak efficiency of 20.34% with suppressed J-V hysteresis, which results from the interaction of derivated graphdiyne and PCBM, to be exact, four types of non-covalent bonds. These findings suggest that derivated graphdiyne could have potential applications in solar cells and other photoelectric devices. [Extracted from the article]

Doping impure atoms into host semiconductor nanocrystals is used to tune the properties and functions of semiconductor nanocrystals (NCs). Here, we demonstrate a solution method for preparing O doped ZnS (ZnS(O)) colloidal NCs. The as-prepared NCs have been proved to be consistent with the crystal structure of ZnS and Zn 3d-O 2p hydrization existed in the as-prepared NCs as certified by O k-edge X-ray absorption spectra (XAS). The average size was measured to be about 8.5 nm by Transmission Electron Microscope (TEM). The role of pyridines was to control the size and tune the surface property. By doping oxygen into ZnS lattice, the energy levels of as-prepared NCs were moved down, giving a better band alignment for photovoltaic application. When it was applied to modify ZnO interlayer and form ZnO/ZnS(O) bilayer in the polymer solar cells (PSCs), the optimal power conversion efficiency (PCE) of the device based on ZnO/ZnS(O) reached 8.85% (8.59 ± 0.49%), which increased by 10% compared to ZnO-only control device with the optimal PCE of 8.00% (7.46 ± 0.54%). The novel approach has been proved to be facile and scalable, paving the way for synthetizing O doped semiconductor nanocrystal. [ABSTRACT FROM AUTHOR]

Recently, ZnCdS nanocrystals (NCs) have attracted intense attention because of their specific optical properties and electrical characteristics. In this paper, a green and facile solution method is reported for the preparation of ZnCdS nanocrystals using dimethylsulfoxide as small molecular ligands. The ZnCdS nanocrystals are used as an interface modification material in the photovoltaic devices. It is found that the modification of ZnCdS on TiO 2 surface not only suppresses the recombination loss of carriers but also reduces the series resistance of TiO 2 /active layer. Consequently, both of the short circuit current ( J sc ) and the fill factor (FF) of the solar cells were significantly improved. Power conversion efficiency (PCE) of 7.75% based on TiO 2 /ZnCdS was achieved in contrast to 6.65% of the reference devices based on pure TiO 2 film in organic solar cells. Furthermore, the PCE of perovskite solar cells based on TiO 2 /ZnCdS was observed with 8.3% enhancement compared to that of pure TiO 2 -based ones. [ABSTRACT FROM AUTHOR]

Hole-transporting materials play an important role in perovskite solar cells. In this study, we introduced a novel hole-transporting material without p-type dopant, a tetrathiafulvalene derivative anchored with eight carboxyl groups (TTA) into inverted structure perovskite solar cells. The devices with TTA as hole-transporting layer showed high power conversion efficiency of 16.7%, which was 44.5% improvement compared with the reference devices without hole-transporting layer. The performance improvement was ascribed to three factors: 1) the better match of energy level between ITO and perovskite layer; 2) enhanced hole extraction at anode interface; 3) improved perovskite morphology. [ABSTRACT FROM AUTHOR]