Microstructural and photoconversion efficiency enhancement of compact films of lead-free perovskite derivative Rb₃Sb₂I₉

Abstract

The microstructural enhancement of Rb3Sb2I9 compact films leads to a photoconversion efficiency boost up to 65.4%.

Lead‐Free Perovskite‐Inspired Absorbers for Indoor Photovoltaics

“…[83] IPV efficiencies higher than a-Si:H could also be expected from Rb 3 Sb 2 I 9 , which, just like BiOI and Cs 3 Sb 2 Cl x I 9-x , is a layered compound with high mobility planes that allow photogenerated charges to be efficiently extracted. [32,50] MA 3 Sb 2 I 9 is another potential material. Although the i-SLMEs of the 0D compound are low, recent work has shown that the 2D phase can be stabilized, leading to a near-direct bandgap (which allows higher absorption coefficients) and a lower bandgap value of 2.1 eV (which is closer to the optimum for IPV).…”

“…Although the lead concentration in lead-halide perovskites is lower than in natural soil, there is evidence that the highly-soluble lead content of lead-halide perovskites is ten times more bioavailable. [31,32] While the challenges of lead-containing compounds in outdoor solar applications are mostly downstream (e.g., recycling and disposal of cells at their end of life), the use of lead-halide perovskites in an indoor environment poses significantly higher risks. [33] In an indoor setting, the encapsulation layer would be the only barrier between the human end-user and the lead contained within the perovskite device, which increases the potential for lead exposure in case of damage to the device.…”

“…[7,14,15] Furthermore, PIMs absorbing in the visible light spectrum come in aesthetically appealing colors, thus addressing the need for photovoltaics that can also carry out a decorative function when deployed in the objects and environments of our daily lives. [32,45,[47][48][49][50][51][52] Additionally, antimony-and bismuthbased PIMs can be synthesized using techniques that are compatible with low-cost flexible plastic substrates, thereby pointing to their integration into a wide range of IoT devices. [53][54][55][56] In this study we aim to shed light on the indoor photovoltaic capabilities and potential of lead-free perovskite-inspired absorbers.…”

“…[44,46,47,50] This allows efficient charge transport within the covalently linked planes, such that >60% external quantum efficiencies could be achieved in devices. [32,45,56] Herein, we investigate the photovoltaic performance of BiOI and Cs 3 Sb 2 Cl x I 9-x devices under FL and WLED illumination, as compared to AM 1.5G radiation, and assess whether their performance is sufficient to power thin-film-transistor (TFT) circuits for digital processing. Furthermore, we perform intensity-dependent measurements and optical loss analyses to determine the pathways for achieving future increases in efficiency.…”

Structure, Morphology, and Photovoltaic Implications of Halide Alloying in Lead‐Free Cs3Sb2ClxI9–x 2D‐Layered Perovskites

“…All‐inorganic (Cs + rather than MA + at the A‐site, for example) Sb‐based perovskite derivatives have attracted significant recent interest because of their lower toxicity, [ 9,13,20,21 ] better moisture stability, [ 13,22,23 ] isoelectronic configuration (ns 2 ), and comparable defect tolerance compared with Pb analogs. [ 24–26 ] For Cs 3 Sb 2 I 9 , the majority of reports have focused on studying and selectively preparing either one or both of the possible perovskite derivative substructures.…”