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Development of Hybrid Pseudohalide Tin Perovskites for Highly Stable Carbon-Electrode Solar Cells
摘要： Tin-based perovskites degrade rapidly upon interaction with water and oxygen in air because Sn–I bonds are weak. To address this issue, we developed novel tin perovskites, FASnI(3-x)(SCN)x (x = 0, 1, 2 or 3), employing a pseudohalide, thiocyanate (SCN?), as a replacement for halides and as an inhibitor to suppress the Sn2+/Sn4+ oxidation. The structural and electronic properties of pseudohalide tin perovskites in this series were explored with quantum-chemical calculations employing the plane-wave density-functional-theory (DFT) method; the corresponding results are consistent with the experimental results. Carbon-based perovskite devices fabricated with tin perovskite FASnI(SCN)2 showed about a three-fold enhancement of the device efficiency (2.4 %) relative to the best FASnI3-based device (0.9 %), which we attribute to improved suppression of formation of Sn4+, retarded charge recombination, enhanced hydrophobicity and stronger interactions between Sn and thiocyanate for FASnI(SCN)2 than for FASnI3. After incorporation of phenylethyleneammonium iodide (PEAI, 10 %) and ethylenediammonium diiodide (EDAI2, 5 %) as co-additives, the FASnI(SCN)2 device gave the best photovoltaic performance with JSC/mA cm–2 = 20.17, VOC/mV = 322, FF = 0.574 and overall efficiency of power conversion PCE = 3.7 %. Moreover, these pseudohalide-containing devices display negligible photocurrent–voltage hysteresis and great stability in ambient air conditions.
关键词： tin perovskite,Perovskite,thiocyanate,pseudohalide,solar cells
更新于2025-09-23 15:19:57
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Ultra-high open-circuit voltage of tin perovskite solar cells via an electron transporting layer design
摘要： Tin perovskite is rising as a promising candidate to address the toxicity and theoretical efficiency limitation of lead perovskite. However, the voltage and efficiency of tin perovskite solar cells are much lower than lead counterparts. Herein, indene-C60 bisadduct with higher energy level is utilized as an electron transporting material for tin perovskite solar cells. It suppresses carrier concentration increase caused by remote doping, which significantly reduces interface carriers recombination. Moreover, indene-C60 bisadduct increases the maximum attainable photovoltage of the device. As a result, the use of indene-C60 bisadduct brings unprecedentedly high voltage of 0.94 V, which is over 50% higher than that of 0.6 V for device based on [6,6]-phenyl-C61-butyric acid methyl ester. The device shows a record power conversion efficiency of 12.4% reproduced in an accredited independent photovoltaic testing lab.
关键词： open-circuit voltage,tin perovskite,indene-C60 bisadduct,solar cells,electron transporting layer
更新于2025-09-19 17:13:59
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Benzodithiophene Hole‐Transporting Materials for Efficient Tin‐Based Perovskite Solar Cells
摘要： Developing efficient interfacial hole transporting materials (HTMs) is crucial for achieving high-performance Pb-free Sn-based halide perovskite solar cells (PSCs). Here, a new series of benzodithiophene (BDT)-based organic small molecules containing tetra- and di-triphenyl amine donors prepared via a straightforward and scalable synthetic route is reported. The thermal, optical, and electrochemical properties of two BDT-based molecules are shown to be structurally and energetically suitable to serve as HTMs for Sn-based PSCs. It is reported here that ethylenediammonium/formamidinium tin iodide solar cells using BDT-based HTMs deliver a champion power conversion efficiency up to 7.59%, outperforming analogous reference solar cells using traditional and expensive HTMs. Thus, these BDT-based molecules are promising candidates as HTMs for the fabrication of high-performance Sn-based PSCs.
关键词： benzodithiophene,tin,perovskite solar cells,triphenylamine,lead-free
更新于2025-09-11 14:15:04
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Recent advances toward efficient and stable tin‐based perovskite solar cells
摘要： Organic-inorganic halide perovskite solar cells (PSCs) are emerging new generation cost-effective photovoltaic technology. However, the public concern about the toxic lead contained in state-of-art PSCs has cast a shadow on their prospect for commercialization. Therefore, increasing attention has been paid to lead-free tin-based perovskites, which have the potential to achieve comparable photovoltaic performance to their lead-based counterparts. However, the development of high-performance tin-based PSCs is seriously undermined by the intrinsic poor stability of divalent tin in the perovskites. With the efforts to overcome the stability issue, encouraging ~10% efficiencies have been currently achieved. In this review, we summarize the recent advances toward efficient and stable tin-based PSCs and offer a perspective for future study.
关键词： tin,Perovskite solar cells,lead-free,Stability,efficiency
更新于2025-09-11 14:15:04