Surface restoration of polycrystalline Sb2Se3 thin films by conjugated molecules enabling high-performance photocathodes for photoelectrochemical water splitting

Tan, Jeiwan; Yang, Wooseok; Lee, Hyungsoo; Park, Jaemin; Kim, Kyung-Min; Hutter, Oliver S.; Phillips, Laurie J.; Shim, Sanggi; Yun, Juwon; Park, Youngsun; Lee, Jeongyoub; Major, Jonathan D.; Moon, Jooho

doi:10.1016/j.apcatb.2021.119890

Cited by 42 publications

(28 citation statements)

References 50 publications

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“…Kelvin probe force microscopy (KPFM) was further applied to probe the effect of CA on surface electronic chemical potential (Figure b). The mean contact potential difference (CPD) value of the CA film was −184 mV lower than that of the control film (−155 mV), which established that the unwanted p-type doping was effectively restricted after the CA modification. − To get a more visual conception, the linear profiles of the CPD value (along the white line) at a distance of 2 μm were also shown in Figure c. In addition, a more homogeneous signal of the films with CA was exhibited compared to the control films in the whole region, which confirmed that CA addition well-passivated defects at film surfaces and grain boundaries, presenting an excellent electronic property for the application of photovoltaic devices.…”

mentioning

confidence: 73%

Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Liu

Wang

et al. 2021

ACS Energy Lett.

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Mixed lead–tin (Pb–Sn) perovskite photovoltaics have attracted great attention for reducing toxic lead and tuning optical bandgaps. However, the main challenges are the uncontrolled crystallization rate of perovskite films and easy oxidation of Sn2+, which can give rise to rough morphology and unwanted p-type doping. Herein, we precisely modulated the crystallization process of the mixed Pb–Sn perovskite by adjusting the energy barrier of nucleation with the help of caffeic acid (CA), a natural antioxidant, which is introduced into the perovskite precursor solution. We demonstrated CA also could depress the oxidation of Sn2+ to Sn4+ effectively by reducing hydroxyl functional groups, leading to the reduction of background carriers and hole trap densities. Therefore, an efficiency of 19.85% was obtained with an impressive open-circuit voltage of 0.855 V for mixed Pb–Sn perovskite solar cells with high reproducibility.

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confidence: 73%

Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Liu

Wang

et al. 2021

ACS Energy Lett.

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“…By comparing Figure e,f, the CPD value of the perovskite film added to NH 4 I significantly increases, and the work function value of the surface decreases consequently according to the above formula. This can enhance the V oc of the device …”

Section: Resultsmentioning

confidence: 99%

“…This can enhance the V oc of the device. 38 For further scrutinization of the quality of perovskite layers, systematic characterizations are deliberately conducted. First of all, the XRD spectrum in Figure 2a presents a typical pattern of two-step deposited perovskite layers where the intensity of peaks related to PbI 2 at 12.8°is higher than that of perovskite typically at the position of 14.1°.…”

Section: Resultsmentioning

confidence: 99%

Manipulated Crystallization and Passivated Defects for Efficient Perovskite Solar Cells via Addition of Ammonium Iodide

et al. 2021

ACS Appl. Mater. Interfaces

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Organic–inorganic metal halide perovskite materials have been widely studied as the light absorber for efficient photovoltaics. However, perovskite layers with defective nature are typically prepared with an uncontrollable crystallization process, intrinsically limiting further advance in device performance, and thus require delicate manipulation of crystallization processes and defect density. Here, we demonstrate an ammonium-assisted crystallization of perovskite absorbers during a two-step deposition to fabricate efficient solar cells. Addition of ammonium iodide (NH4I) is devised to manipulate the nucleation and crystal growth of perovskite, wherein the formation and transition of intermediate x[NH4 +]•[PbI3] x− enables high-quality perovskite layers with an enlarged grain and reduced defect density. As a result, the perovskite solar cells (PSCs) achieve an average efficiency of 21.36% with a champion efficiency of 22.15% and improved environmental stability over 30 days in ambient conditions with varied relative humidity. These results with addition of NH4I provide an available and ingenious way to construct high-quality perovskite layers for efficient solar cells and will advance the commercial application of perovskite-based photovoltaics.

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“…For further improving the PEC performance, the interface modification strategy can be introduced between Sb 2 Se 3 and TiO 2 to transfer the charges effectively. [25,31,52] An efficient overall sunlight-driven water splitting device can be achieved by pairing photoanode and photocathode in an optical tandem design. Perovskite solar cells with tunable absorption ranges and open-circuit voltage provide new opportunities for tailoring top absorbers for such tandem devices.…”

Section: Resultsmentioning

confidence: 99%

“…For further improving the PEC performance, the interface modification strategy can be introduced between Sb 2 Se 3 and TiO 2 to transfer the charges effectively. [ 25,31,52 ]…”

Section: Resultsmentioning

confidence: 99%

Controlling the Crystallographic Orientation of Sb₂Se₃ Film for Efficient Photoelectrochemical Water Splitting

Wang

Zhang

et al. 2021

Solar RRL

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Finding a cost-effective semiconductor with commercial performance for photoelectrochemical (PEC) water splitting remains challenging. Sb 2 Se 3 , as a low-cost semiconductor, has excellent photo/electric properties for PEC water splitting. Via adjusting the Sb/Se ratio in the precursor ink, the Sb 2 Se 3 with favorable crystallographic orientation can be effectively controlled. The ink with an atomic ratio of Sb/ Se ¼ 1:3 induces the growth of a compact Sb 2 Se 3 film with a preferred orientation, resulting in rapid charge transport and high photocurrent. After depositing TiO 2 and Pt in turn, the photocathode with a structure of FTO/Au/Sb 2 Se 3 /TiO 2 /Pt exhibits a photocurrent density of 11.3 mA cm À2 at 0 V RHE . An unassisted solar water splitting device integrating the Sb 2 Se 3 -based photocathode with an inorganic perovskite photovoltaic cell achieves a solar-to-hydrogen efficiency of 2.45%. The efficient Sb 2 Se 3 -based photocathode shows promising potential for solar fuel production.

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Surface restoration of polycrystalline Sb2Se3 thin films by conjugated molecules enabling high-performance photocathodes for photoelectrochemical water splitting

Cited by 42 publications

References 50 publications

Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Manipulated Crystallization and Passivated Defects for Efficient Perovskite Solar Cells via Addition of Ammonium Iodide

Controlling the Crystallographic Orientation of Sb₂Se₃ Film for Efficient Photoelectrochemical Water Splitting

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Surface restoration of polycrystalline Sb2Se3 thin films by conjugated molecules enabling high-performance photocathodes for photoelectrochemical water splitting

Cited by 42 publications

References 50 publications

Modulated Crystallization and Reduced VOC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Modulated Crystallization and Reduced VOC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Manipulated Crystallization and Passivated Defects for Efficient Perovskite Solar Cells via Addition of Ammonium Iodide

Controlling the Crystallographic Orientation of Sb2Se3 Film for Efficient Photoelectrochemical Water Splitting

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Product

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Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Modulated Crystallization and Reduced V_OC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Controlling the Crystallographic Orientation of Sb₂Se₃ Film for Efficient Photoelectrochemical Water Splitting