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An open-cage bis[60]fulleroid (OC) was applied as an electron transport material (ETM) in tin (Sn) halide perovskite solar cells (PSCs). Due to the reduced offset between the energy levels of Sn-based perovskites and ETMs, the power conversion efficiency (PCE) of Sn-based PSCs with OC reached 9.6% with an open-circuit voltage (VOC) of 0.72 V. Additionally, OC exhibited superior thermal stability and provided 75% of the material without decomposition after vacuum deposition. The PSC using vacuum-deposited OC as the ETM could afford a PCE of 7.6%, which is a big leap forward compared with previous results using vacuum-deposited fullerene derivatives as ETMs. [ABSTRACT FROM AUTHOR]

Highly photoluminescent, lead‐free perovskites are of interest for displays and solid‐state light‐emitting devices. In this report, streak camera‐based time‐resolved emission and transient absorption spanning visible to deep‐ultraviolet (UV) wavelengths are utilized to study self‐trapped and free exciton dynamics in vacuum‐deposited cesium copper halide thin films of CsCu2I3 and Cs3Cu2I5. Self‐trapped exciton emission of CsCu2I3 exhibits more noticeable changes with time in the peak position and width than Cs3Cu2I5. UV‐to‐blue emission is detectable for both compositions, where free exciton emission is distinct for CsCu2I3. Transient absorption shows loss of ground‐state bleach signals at early time delays for both, and the bleach signal shifts toward higher energy as time delay increases, likely due to strains induced by the newly created self‐trapped excitons. Global analysis performed on the transient absorption results yields time constants in these materials that build an overall dynamic scheme. This work aids in building a complete picture regarding light emission in these promising materials. [ABSTRACT FROM AUTHOR]

The use of photovoltaic cells with an organometallic perovskite as the active layer for indoor dim-light energy harvesting is evaluated. By designing the electron-transporting materials and fabrication processes, the traps in the perovskite active layers and carrier dynamics can be controlled, and efficient devices are demonstrated. The best-performing small-area perovskite photovoltaics exhibit a promising high power conversion efficiency up to 27.4%, no hysteresis behavior, and an exceptionally low maximum power point voltage variation of 0.1 V under fluorescent lamp illumination at 100-1000 lux. The 5.44 cm² large-area device also shows a high efficiency of 20.4% and a promising long-term stability. Compared with the most efficient inorganic and organic solar cells nowadays, the competitive efficiency, low fabrication cost, and low raw material costs make perovskite photovoltaics ideal for indoor light harvesting and as Internet of Things power provider. [ABSTRACT FROM AUTHOR]

Vacuum Fabrication: Efficient Cesium Lead Halide Perovskite Solar Cells through Alternative Thousand-Layer Rapid Deposition (Adv. Funct. Keywords: alternative deposition; cesium; perovskite solar cells; vacuum deposition Alternative deposition, cesium, perovskite solar cells, vacuum deposition. [Extracted from the article]

The novel growth of cesium lead halide perovskite thin films, which are prepared through thousand‐layer rapid alternative deposition, is performed by developing an active perovskite film consisting of a layer‐by‐layer structure. This method is considerably more difficult to be implemented from the solution process. The obtained thin film morphology and characteristics are distinguished from that of the traditional a few layers and two‐material codeposition. These alternative deposited perovskites are integrated with vacuum‐deposited carrier‐transporting layers and electrodes, and all vacuum‐sublimed perovskite solar cells exhibit an outstanding power conversion efficiency of 13.0%. The use of these devices for environmental light energy harvesting provides a power conversion efficiency of 33.9% under fluorescent light illumination of 1000 lux. [ABSTRACT FROM AUTHOR]

[Display omitted] • First investigation for the panchromatic absorption from Sb based perovskites by using complimentary absorbing ETLs. • Adduct formation for ITIC molecule with Cs 3 Sb 2 I 9 have also been investigated. • Optical simulations were conducted to calculate the contribution to current density from each layer. • Best solar cell efficiency of 3.2% for inorganic Sb based perovskite was achieved. • A 3 B 2 X 9 perovskite is studied under indoor light illumination and an efficiency of 9.2% was achieved under 1000 Lux. The search for stable alternative lead-free perovskites has identified all-inorganic antimony/bismuth halide derivatives as promising materials. Despite attractive optoelectronic properties, their wider band gaps and poor morphological control have greatly limited their solar device performance. In this study, we used the indacenodithiophene-based organic acceptor (ITIC) as a Lewis base to improve the morphology of Cs 3 Sb 2 I 9 films and also as an electron transport layer to form a complimentary heterojunction, and, thereby, enhance the performance of Cs 3 Sb 2 I 9 solar cells. The presence of cyano and carbonyl groups in ITIC modulated the rate of crystallization of Cs 3 Sb 2 I 9 and improved its optoelectronic properties. The panchromatic absorption of the Cs 3 Sb 2 I 9 /ITIC heterostructure provided a power conversion efficiency of 3.25% in inverted solar cell structure under 1-sun irradiation. This enhanced performance when using a complimentary absorption strategy suggests a new pathway for developing wider-band-gap lead-free perovskite derivatives for solar cell applications. Moreover, the optimized Cs 3 Sb 2 I 9 /ITIC heterostructure–based solar cell achieved a PCE of 9.2% under indoor illumination at 1000 lx, highlighting the potential use of such devices in indoor applications. [ABSTRACT FROM AUTHOR]