研究目的
Investigating the fabrication and performance of highly efficient bifacial CsPbIBr2 solar cells with a TeO2/Ag transparent electrode and unsymmetrical carrier transport behavior.
研究成果
The study successfully fabricated efficient semitransparent bifacial CsPbIBr2 PSCs with superior PCEs of 8.46% and 6.40% when illuminated from the FTO and Ag sides, respectively, achieving a bifacial factor of 75.65%. The use of an ultrathin Ag film and TeO2 modifying layer, along with CsI treatment, significantly improved the film quality and device performance. The findings highlight the potential of CsPbIBr2 PSCs in applications such as smart photovoltaic windows and tandem solar cells, with the recommendation to orient the Ag side towards the sun for enhanced performance and stability.
研究不足
The study acknowledges the probable phase segregation in the CsPbIBr2 films induced by light illumination, which could lead to JV hysteresis. Additionally, the parasitic absorption of the spiro-OMeTAD layer below 420 nm affects the EQE values and overall performance when illuminated from the Ag side.
1：Experimental Design and Method Selection:
The study involved the fabrication of bifacial CsPbIBr2 perovskite solar cells (PSCs) using an ultrathin silver (Ag) film transparent anode and a tellurium oxide (TeO2) optical modifying layer. The transmittance and conductivity of the Ag film were optimized by adjusting its thickness and applying a TeO2 modifying layer.
2：Sample Selection and Data Sources:
CsPbIBr2 films were prepared using a one-step solution-processed method, with some samples treated with cesium iodide (CsI) to improve film quality.
3：List of Experimental Equipment and Materials:
The study utilized FTO and Ag films as electrodes, TiO2 and spiro-OMeTAD as electron and hole transport layers, respectively, and CsPbIBr2 as the perovskite material.
4：Experimental Procedures and Operational Workflow:
The fabrication process included the deposition of TiO2, CsPbIBr2, spiro-OMeTAD, and Ag/TeO2 layers, followed by characterization of the films and devices using SEM, XRD, PL spectra, UV–vis absorption spectra, and photovoltaic performance measurements.
5：Data Analysis Methods:
The performance of the PSCs was evaluated based on power conversion efficiency (PCE), fill factor (FF), open-circuit voltage (VOC), and short-circuit current density (JSC). Transient photocurrent and photovoltage (TPC and TPV) tests were conducted to understand carrier transport and recombination processes.
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