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Lead‐based halide perovskites have gained significant prominence in recent years in optoelectronics and photovoltaics, owing to their exceptional optoelectronic properties. Nonetheless, the toxicity of lead (Pb) and the stability concern pose obstacles to their potential for future large‐scale market development. Herein, stable lead‐free Cs3Bi2I9 (CBI) films are presented with smooth and compact morphologies synthesized via chemical vapor deposition (CVD), demonstrating their application as an UV photodetector in a self‐powered way. The self‐powered photodetectors (SPDs) exhibit remarkable characteristics, including a responsivity of 1.57 A W−1 and an impressive specific detectivity of 3.38 × 1013 Jones under the illumination of 365 nm at zero bias. Furthermore, the SPDs exhibit a nominal decline (≈2.2%) in the photocurrent under constant illumination over 500 h, highlighting its impressive long‐term operational stability. Finally, the real‐time UV‐detection capability of the device is demonstrated by measuring the photocurrent under various conditions, including room light and sunlight at different times. These findings offer a new platform for synthesizing stable and high‐quality perovskite films, and SPDs for advancing the development of wearable and portable electronics. [ABSTRACT FROM AUTHOR]

The effect of electroless wet treatment on multi-crystalline silicon solar cells was investigated. We prepared nanostructures on a multi-crystalline silicon surface via wet nano-texturing processes to ensure that less light is reflected off the surface. Nano-texturing can reduce the average reflectance to about 2.5% in the wavelength range of 400-900 nm. Further, we obtained an effective reflectance of 1.9% with Al2O3/SiNx:H coating. The use of our wet nano-texturing process resulted in a reflectance value lower than that obtained with conventional acid texturization. Thus, the nano-texturing of multi-crystalline silicon via the wet chemical process can further increase the efficiency of silicon solar cells (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]