Unprecedented Wavelength Dependence of an Antimony Chalcohalide Photovoltaic Device

Abstract

The output of a photovoltaic (PV) device follows the Shockley diode equation, where its open‐circuit voltage (VOC) is marginally modulated by the photocurrent density and light intensity. Herein, an unprecedented wavelength‐dependent photovoltaic effect (WDPE) in antimony chalcoiodide (SbSI) and SbSI:Sb2S3 devices is reported, which demonstrate a rapid, reversible change of VOC by changing irradiation wavelength. The VOC in a SbSI:Sb2S3 device is varied from 0.35 to 0.47 V under 375 and 515 nm light without a change of photocurrent. Such a dramatic shift in VOC is not observed in silicon, perovskites, or organic solar cells. WDPE allows for a wavelength‐recognizable single‐junction photodetector without using a color filter, and is not explained by the conventional diode model. Based on the time‐resolved evaluations of charge carriers, the interfacial metastable trap of a hot carrier generated by short‐wavelength light as the origin of the observed anomalous behavior is identified. Interestingly, the trap states and photocurrent kinetics are affected by humidity and ammonium gas, which provide another multifunctional aspect of the WDPE. These findings provide deep insight into PV physics and a new way to detect color using a single cell.

Heavy pnictogen chalcohalides for efficient, stable, and environmentally friendly solar cell applications

“…Another binary chalcogenide-containing heterostructure composed of SbSI/Sb 2 S 3 was reported by Nishikubo et al [89,90], where SbSI and SbSI/Sb 2 S 3 films were fabricated using a simple solution-phase method based on a precursor solution containing SbI 3 and Sb(CH 3 CH 2 OCS 2 ). By adjusting the HTL (PCPDTBT) and the fabrication temperature (240 °C), they obtained a maximum PCE of 2.91% from the SbSI/Sb 2 S 3 device (figures 11(a)-(d)) [89].…”

“…By adjusting the HTL (PCPDTBT) and the fabrication temperature (240 °C), they obtained a maximum PCE of 2.91% from the SbSI/Sb 2 S 3 device (figures 11(a)-(d)) [89]. Further, they investigated the effects of irradiation (wavelengths of 375 and 515 nm) on the performance of the solar cell [90]. They observed an unusual photovoltaic effect, which was not observed in other solar cells.…”

Polarization‐Sensitive Photodetector Based on High Crystallinity Quasi‐1D BiSeI Nanowires Synthesized via Chemical Vapor Deposition

“…[ 9–17 ] Several notable properties including compositionally tunable bandgaps, either p ‐type or n ‐type conductivity, ferroelectricity, thermoelectric, piezoelectricity and photocatalytic activity have been explored from this class of materials, which endow them various potential applications, such as field effect transistors, photodetectors, photovoltaic devices, supercapacitors and photocatalysts, etc. [ 18–29 ]…”

Wavelength‐Recognizable SbSI:Sb2S3 Photovoltaic Devices: Elucidation of the Mechanism and Modulation of their Characteristics

“…In contrast, we recently reported an anomalous wavelength-dependent photovoltaic effect (WDPE) in SbSI:Sb 2 S 3 mixture-based devices that could not be explained by the conventional Shockley model. [12] The SbSI:Sb 2 S 3 -based device (fluorine-doped tin oxide (FTO)/TiO 2 /SbSI:Sb 2 S 3 /polycyclopentadithiophene benzothiadiazole (PCPDTBT)/Au) exhibited a rapid and reversible decrease in photovoltage when subjected to short-wavelength (SW, < 500 nm) light irradiation. Although SbSI and Sb 2 S 3 have garnered significant attention owing to the possibility of several application such as photovoltaics, [13][14][15] ferroelectric material, [16,17] and photocatalyst, [18] their WDPE behaviors have remained unexplored.…”

“…However, only our WDPE framework has achieved color detection using a simple single-junction cell without an applied voltage. [12] Despite the uniqueness and effectiveness of WDPE, its mechanism and the effect of device structure remain unclear. In our previous study, [12] the mechanism of the temporal decrease in photovoltage by SW (375 nm) irradiation was studied by J-V measurements, transient photovoltage (TPV), charge extraction by linearly increasing voltage (CELIV), and device simulation.…”