研究目的
To investigate the fabrication and performance of periodic nanopillar array solar cells based on n-i-p thin-film amorphous silicon using scaffolds of vertically aligned carbon nanotube arrays, focusing on the effects of CNT spacing on optical and electrical properties.
研究成果
Periodic NP array solar cells with CNT spacing less than 1000 nm demonstrate 'moth-eye' antireflection behavior, enhancing photocurrent and spectral responsivities. However, Voc is strongly affected by CNT array spacing due to higher photocarrier recombination. These NP arrays are more suitable for energy harvesting under indoor environments, with advanced deposition techniques or passivation materials needed for outdoor applications.
研究不足
The study is limited by the nonuniformity in CNT length, which affects NP length uniformity. The electrical performance of NP solar cells is adversely affected by recombination losses, especially under high illumination intensity.
1：Experimental Design and Method Selection:
The study involved the fabrication of NP array solar cells using CNT scaffolds with varying spacings (800, 1000, and 2000 nm) to examine their optical and electrical properties.
2：Sample Selection and Data Sources:
CNT arrays were grown on low doped crystalline Si substrates, and amorphous Si PV devices were deposited using RF-PECVD.
3：List of Experimental Equipment and Materials:
SEM for structure investigation, optical fibre reflectance measurement setup for optical reflectance, semiconductor analyzer for electrical performance, and solar simulator for illumination conditions.
4：Experimental Procedures and Operational Workflow:
Fabrication involved CNT growth, Cr thin film deposition, amorphous Si layer deposition, ITO sputtering, and reactive ion etching.
5：Data Analysis Methods:
Optical and electrical properties were analyzed, including reflectance spectra, J-V characteristics, and EQE measurements.
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