key-factors-affecting-performance-sb2s3-sensitized-solar-cells-during

Key Factors Affecting the Performance of Sb2S3-sensitized Solar Cells During an Sb2S3 Deposition via SbCl3-thiourea Complex Solution-processing

Sb2S3 is considered as one of the emerging light absorbers that can be applied to next-generation solar cells because of its unique optical and electrical ...

Ulsan National Institute of Science and Technology (UNIST)

Although perovskite solar cells (PSCs) surpassing 20 % in certified power conversion efficiency (PCE) have been demonstrated with organic hole-transporting layers (HTLs), thermal degradation remains one of the key issues for practical applications. We fabricated PSCs using low temperature solution-processed CuSCN as the inorganic hole-transport layer (HTL), which possesses a highly stable crystalline structure and is robust even at high temperatures. The best-performing cell delivers a PCE of 18.0 %, with 15.9 % measured at the stabilized power output. Here we report the thermal stability of PSCs based on CuSCN in comparison with commonly used 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD). The PSC fabricated with organic spiro-OMeTAD degrades to 25 % of initial PCE after annealing for 2 h at 125 °C in air under 40 % average relative humidity. However, CuSCN-based PSCs maintain approximately 60 % of the initial value, exhibiting superior thermal stability under identical conditions. This work demonstrates that high efficiency and improved thermal stability are simultaneously achieved when CuSCN is used as an HTL in PSCs.

Thermal Stability of CuSCN Hole Conductor-Based Perovskite Solar Cells.

Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO) as an electron-transporting layer. However, TiO can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500°C. We report a superoxide colloidal solution route for preparing a LBSO electrode under very mild conditions (below 300°C). The PSCs fabricated with LBSO and methylammonium lead iodide (MAPbI) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.

Colloidally prepared La-doped BaSnO electrodes for efficient, photostable perovskite solar cells.

We have designed and synthesized fluorinated indolo[3,2-]indole (IDID) derivatives as crystalline hole-transporting materials (HTM) for perovskite solar cells. The fluorinated IDID backbone enables a tight molecular arrangement stacked by strong π-π interactions, leading to a higher hole mobility than that of the current HTM standard, ,-spiro-OMeTAD, with a spherical shape and amorphous morphology. Moreover, the photoluminescence quenching in a perovskite/HTM film is more effective at the interface of the perovskite with  as compared to that of ,-spiro-OMeTAD. As a consequence, the device fabricated using  shows superior photovoltaic properties compared to that using ,-spiro-OMeTAD, exhibiting an optimal performance of 19%. Thus, this remarkable result demonstrates IDID core-based materials as a new class of HTMs for highly efficient perovskite solar cells.

Indolo[3,2-]indole-based crystalline hole-transporting material for highly efficient perovskite solar cells.

The formation of a dense and uniform thin layer on the substrates is crucial for the fabrication of high-performance perovskite solar cells (PSCs) containing formamidinium with multiple cations and mixed halide anions. The concentration of defect states, which reduce a cell's performance by decreasing the open-circuit voltage and short-circuit current density, needs to be as low as possible. We show that the introduction of additional iodide ions into the organic cation solution, which are used to form the perovskite layers through an intramolecular exchanging process, decreases the concentration of deep-level defects. The defect-engineered thin perovskite layers enable the fabrication of PSCs with a certified power conversion efficiency of 22.1% in small cells and 19.7% in 1-square-centimeter cells.

Article	Year
Thermal Stability of CuSCN Hole Conductor-Based Perovskite Solar Cells. ChemSusChem\| PubMed ID: 27611720	2016
Colloidally prepared La-doped BaSnO electrodes for efficient, photostable perovskite solar cells. Science (New York, N.Y.)\| PubMed ID: 28360134	2017
Indolo[3,2-]indole-based crystalline hole-transporting material for highly efficient perovskite solar cells. Chemical science\| PubMed ID: 28451221	2017
Iodide management in formamidinium-lead-halide-based perovskite layers for efficient solar cells. Science (New York, N.Y.)\| PubMed ID: 28663498	2017

Sangl Il Seok

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