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This study introduces a remarkably sensitive self‐powered Ultra Violet (UV) photodetector utilizing photosynthetic algae coupled with modified electrodes. The device achieves exceptional sensitivity and stability in photodetection under self‐powered operation by leveraging photosynthetic green algae. Notably, the device demonstrates impressive responsivity, and detectivity of 0.44 A W−1, and 4 ×1010 Jones respectively for 365 nm of the incident light with the lowest intensity of 530 nW cm−2 at zero bias condition. Additionally, it exhibits rapid rise and decay times, clocking in at 0.15 and 0.16 s, respectively, for optimized performance. This self‐powered algal UV photodetector offers high sensitivity, stability, and swift response/recovery rates, presenting a promising solution for current challenges in UV detection applications for sustainable society. [ABSTRACT FROM AUTHOR]

Metal halide-perovskite-quantum dots (MH-PQDs) have gained wide attention due to their tunable optoelectronic properties and better stability against the ambient environment compared to organometal halide-based PQDs. The stability of the perovskite QDs is of utmost importance, considering their application in light emitting diodes and photodetectors. Herein, we have systematically analyzed the stability of perovskite QDs and have fabricated a photodetector device by using the most stable Mn2+:CsPb(Br1−xClx)3 QDs. The manuscript discusses the synthesis of CsPbBr3 QDs and manganese (Mn) doped Mn2+:CsPb(Br1−xClx)3 QDs using the ligand-assisted re-precipitation (LARP) technique and have studied the correlation between various dopant concentrations and stability. Different concentrations of Mn2+ doping (0.7, 1, 1.5, and 3 mmol of MnCl2·4H2O) in CsPb(Br1−xClx)3 QDs were investigated to study the stability by aging and the optimum concentration of Mn2+ that could be doped into CsPb(Br1−xClx)3 QDs which offered better stability concerning its photoluminescence was found. The optical properties of the synthesized QDs were characterized using UV-Vis absorbance, photoluminescence (PL), and time resolved photoluminescence spectroscopy (TRPL) techniques. The formation of CsPbBr3 QDs with a size of 25.80 ± 3.69 nm and Mn2+:CsPb(Br1−xClx)3 QDs with a size of 22.65 ± 3.28 nm was confirmed by using the high resolution transmission electron microscopy (HR-TEM) technique. TRPL analysis revealed the d–d emission of the Mn2+:CsPb(Br1−xClx)3 QDs at 600 nm due to Mn2+ doping. Furthermore, the self-powered photodetector device was fabricated by using stable 0.7 mmol Mn2+-doped CsPb(Br1−xClx)3 QDs and achieved a quick response, such as a rise time (ton) of 438 ± 8 ms and fall time (toff) of 592 ± 11 ms under one sun illumination. This work could be useful in the field of optoelectronics, especially in the study of doped semiconductor QDs. [ABSTRACT FROM AUTHOR]

• Solution-processed self-powered photodetector with cadmium sulfide as the active energy material. • The layers of the CdS were varied by SILAR method. • Carbon was deposited over the CdS as a hole transport layer. • The device showed a responsivity and detectivity of 115 μA/W and 0.35 ✗109 Jones and a rapid rise and fall time as fast as 0.16 s and 0.12 s. In this work, self-powered photodetectors were fabricated by a simple, cost-effective method using cadmium sulfide (CdS) as photoactive layer and carbon as a hole transport layer. A study on the performance of photodetectors with varied thickness of CdS layers deposited on an FTO coated glass substrate via the Successive Ionic Layer Adsorption and Reaction (SILAR) method is studied in detail. X-Ray diffraction (XRD) data confirms the formation of the CdS layer. Field emission scanning electron microscopy (FESEM) and elemental mapping shows the spherical clustered formation with a uniform distribution of CdS nanoparticles. The band gap of the CdS layers in the range of 2.25 to 2.38 eV is closer to the desired band gap of visible light photodetector. Though solution-processed photodetectors show a very weak photoresponse, the fabricated device shows a responsivity of 0.11✗10−3 A/W and a rapid rise and fall time as fast as 0.16 s and 0.12 s. [Display omitted] [ABSTRACT FROM AUTHOR]

In recent times, hybrid organic-inorganic lead halide perovskites have garnered significant attention in the realm of optoelectronic devices. Metal halide perovskites are extensively researched for photodetection due to their exceptional optical and electrical properties. However, the toxicity of lead and the unstable nature of organic components are limiting its potential. Lead-free perovskites, on the other hand, have low toxicity and are being explored as a promising material for photodetector applications. However, achieving self-powered perovskite photodetectors with high photoresponse, broad spectral sensitivity, and long-term stability remains challenging Among them, Cs 3 Bi 2 I 9 perovskites have emerged as standout, garnering attention for their environmentally friendly nature, impressive stability, and heightened photosensitivity. Herein, FTO/ Al-doped ZnO (AZO)/Cs 3 Bi 2 I 9 /P3HT/C self-powered ultra-violet (UV) photodetector. This device demonstrated outstanding self-powered photodetection capabilities with a photoresponsivity of 29 mA/W, a specific detectivity of 1.05×1011 Jones, and an impressive response rise and decay time of 90 ms /140 ms. Furthermore, the PDs device can function as a bias-based UV photodetector. [Display omitted] • A lead-free Cs 3 Bi 2 I 9 self-powered ultraviolet photodetector was fabricated using a solution process method. • The device structure was FTO/ AZO/Cs 3 Bi 2 I 9 /P3HT/C. • The photodetector exhibits a responsivity of 29 mA/W and a detectivity of 1.05×1011 Jones. • The rise and decay times of the photodetector are 90 ms and 140 ms respectively. [ABSTRACT FROM AUTHOR]

Optoelectronics and sensing devices play a significant role in modern society, driving the research community to explore advanced semiconducting materials and device architecture with low energy consumption. Quaternary rare-earth copper oxychalcogenides have garnered substantial attention owing to their potential use as p -type semiconductors. In the present work, layered bismuth copper-oxysulfide (BiCuOS) is synthesized by a low-temperature hydrothermal reaction. Successful material synthesis is asserted using X-ray diffraction, Raman, and X-ray Photoelectron spectroscopic studies. The BiCuOS semiconductor showed p -type character with an observed indirect bandgap of 1.05 eV. We further developed an n-Si/BiCuOS/p-CuI heterojunction photodetector with an impressive response time of milliseconds. It possessed a remarkable spectral detectivity of 2.7 × 109 Jones in the red light of 620 nm under self-powered conditions and a capable detection over the 405−850 nm wavelength range. The proposed Si/BiCuOS/p-CuI heterojunction is expected to have great potential for broadband light detection applications as high-performance devices. [Display omitted] • Successful synthesis of layered BiCuOS through hydrothermal technique. • A self-powered hybrid photodetector with response times of 100–300 ms. • Broadband photodetection in the Vis-NIR range has been effectively achieved. • Pyroelectric actions enhance photocurrent in 850 nm IR detections. [ABSTRACT FROM AUTHOR]

• Thiourea stabilized BiFeO3 and Carbon thin film heterostructure device act as a self-powered photodetector device. • Complexation of surface thiourea with metal ions through sulfur atoms enhanced the photocurrent of BiFeO 3 film. • Carbon electrode assist as a hole collector. Herein we report the performance of white-light photodetector fabricated by thiourea stabilized bismuth ferrite(BFO-TU) film as a photoactive layer and carbon as a hole collector. The heterojunction BFO/Carbon helps in excitons dissociation and thereby enhanced the device performance. Under the self-powered condition, the device fabricated with a thickness of 1.2 μm exhibited maximum responsivity and detectivity of 2.85 μA/W and 4.06 × 107 Jones respectively for incident light of power 100 mW/cm2. Besides, the device shows excellent stability and repeatability with a high ON/OFF ratio. [ABSTRACT FROM AUTHOR]

• Acetophenone has been used as solvent to synthesize pure phase MAPbI 3 microcrystals. • FTO/TiO 2 /MAPbI 3 – carbon composite device behaves as self-powered photodetector. • MAPbI 3 – carbon composite provides a mean to fabricate inexpensive solution processed self-powered photodetector. • 20 wt% of MAPbI 3 powder in carbon composite matrix exhibits 200 ms as rise time for the photodetector device. Organometallic halide perovskite as Methyl Ammonium Lead iodide (MAPbI 3) is the basis of current focus of solar energy materials research. Here we report acetophenone assisted pure phase MAPbI 3 powder crystals synthesis for fabrication of inexpensive self-powered photodetector. The as fabricated photodetector ascertain, response time of 200 ms with detectivity ∼8.2 × 1011 jones at zero bias voltage and the SNR ∼4 × 103 under white light illumination intensity (19 mW/cm2). Wt% variation of MAPbI 3 reveals that 20 wt% of the perovskite crystals in carbon matrix is better candidate for a compatible photodetector. [ABSTRACT FROM AUTHOR]

• Surface passivation of CsPbBr 3 perovskite microcrystals by Camphor sulfonic acid (CSA). • Binding of CSA on CsPbBr 3 microcrystals enhances photo-emission and stability of perovskites. • Higher photo responsivity of FTO/TiO 2 /CsPbBr 3 -CSA/Carbon self-powered photodetector. • Photodetector exhibited higher photo detectivity under white light. The surface modification of CsPbBr 3 perovskite provides an effective way of defect passivation for device applications. In this work, Camphor sulfonic acid (CSA) was used to modify the surface of CsPbBr 3 microcrystals (MCs) and helped in enhancement of Photoluminescence (PL) emission, photoresponse, and photodetectivity. We fabricated the perovskite FTO/c-TiO 2 /CsPbBr 3 -CSA/Carbon composite self-powered photodetector. The device exhibited higher photo responsivity and detectivity of 1.523 mA/W and 2.1454 × 109 Jones, respectively, under white light with excellent stability on high ON/OFF cycles. [ABSTRACT FROM AUTHOR]

• Cs 3 Sb 2 Cl 3 Br 6 perovskite microcrystals were fabricated. • Without modifying the perovskite crystal structure, mixed halides were incorporated in Cs 3 Sb 2 Cl 3 Br 6 microcrystals. • Lateral photodetector were fabricated from the Cs 3 Sb 2 Cl 3 Br 6 microcrystals contains composite carbon paste. • Photo-response of Cs 3 Sb 2 Cl 3 Br 6 perovskite microcrystals based photodetector was investigated in self powered mode. Herein, the present study focus on synthesis of lead-free Cs 3 Sb 2 Cl 3 Br 6 microcrystals via a simple solution processing method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis confirms the formation hexagonal phase of Cs 3 Sb 2 Cl 3 Br 6 perovskite. Scanning electron microscopy (SEM) and TEM morphology reveals the presence of hexagonal shape of Cs 3 Sb 2 Cl 3 Br 6 microcrystals. UV-Vis diffuse-reflectance spectroscopy (UV-Vis DRS) endorse the formation of 2.55 eV direct bandgap Cs 3 Sb 2 Cl 3 Br 6. A lateral type self-power photodetector was fabricated via cost-effective method using Cs 3 Sb 2 Cl 3 Br 6 and carbon materials and it shows a fast ON and OFF (0.92 s & 0.70 s) with a high responsivity of 1 µA/W at zero bias. [ABSTRACT FROM AUTHOR]

• Double perovskites Cs 4 CuSb 2 Cl 12 microcrystals were synthesised by simple solution method. • Photoresponsive composite carbon paste was fabricated by mixing carbon and perovskites Cs 4 CuSb 2 Cl 12 microcrystals. • Self powered photodetector were fabricated by single step printed method. Recently reported double perovskites (DPs), Cs 4 CuSb 2 Cl 12 has led to the development of a new lead free perovskite. It is 1 eV band gap material. The perovskite microcrystals were synthesized via liquid phase method. This was investigated as active solar energy materials for visible-light photodetector. The microcrystalline device was made in a single-step printable Cs 4 CuSb 2 Cl 12 /carbon materials composite paste. 10 wt% active material composite was found to be the best candidate for the highest responsivity, 10 - 3 A/W and detectivity, 10 8 J. One-step printing of the composite paste can be used for cost effective photodetector applications. [ABSTRACT FROM AUTHOR]