TiO2의 GO 혼합 양에 따른 페로브스카이트 태양전지의 물성 연구 (Properties of Perovskite Solar Cells with GO Addition on TiO2 Layer)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 57권 / 7호 / 456 ~ 461페이지
· 저자명 : 이혜령, 김광배, 송오성

초록

The photovoltaic properties of perovskite solar cells (PSCs) were investigated by adding graphene oxide (GO) to the electron transport layer of TiO2. The PSCs were fabricated with a glass/FTO/BL-TiO2/meso- TiO2 + GO/perovskite/HTL/Au electrode structure by adding various contents of GO (0.0, 0.3, 0.5 and 0.7 wt%) to the TiO2 layer. To analyze the photovoltaic characteristics and transmittance of the TiO2 layer of the PSCs according to the GO content, solar simulator and ultraviolet-visible-near-infrared spectroscopy were used, respectively. Atomic force microscopy and field emission scanning electron microscope were used to analyze the microstructures of both the TiO2 layer and the perovskite layer. The results of the photovoltaic characteristics indicated that energy conversion efficiency (ECE) was gradually increased to 12.70%, 13.13%, 14.19%, and 12.63% for 0.0, 0.3, 0.5, and 0.7 wt% GO contents, respectively. The highest ECE was observed at a GO content of 0.5 wt%, and a decrease in the ECE was confirmed at higher levels. The increase in ECE was confirmed by measuring short circuit current density (Jsc) and shunt resistance which increased with the GO addition. However, when an excessive amount of GO content was added, a decrease in the ECE was observed, due to the decrease in Jsc by the reduction in transmittance. In particular, an increase in the perovskite crystal size caused an increase in the ECE, due to the increased rms of TiO2 at 0.5 wt% GO. With the 0.7 wt% GO TiO2 layer, the perovskite grain size was decreased by the reduction in rms, and this resulted in a decrease in Jsc and ECE. These results suggest that we might improve the efficiency of perovskite solar cells by adding the proper amount of GO to the TiO2 layer.

영어초록

The photovoltaic properties of perovskite solar cells (PSCs) were investigated by adding graphene oxide (GO) to the electron transport layer of TiO2. The PSCs were fabricated with a glass/FTO/BL-TiO2/meso- TiO2 + GO/perovskite/HTL/Au electrode structure by adding various contents of GO (0.0, 0.3, 0.5 and 0.7 wt%) to the TiO2 layer. To analyze the photovoltaic characteristics and transmittance of the TiO2 layer of the PSCs according to the GO content, solar simulator and ultraviolet-visible-near-infrared spectroscopy were used, respectively. Atomic force microscopy and field emission scanning electron microscope were used to analyze the microstructures of both the TiO2 layer and the perovskite layer. The results of the photovoltaic characteristics indicated that energy conversion efficiency (ECE) was gradually increased to 12.70%, 13.13%, 14.19%, and 12.63% for 0.0, 0.3, 0.5, and 0.7 wt% GO contents, respectively. The highest ECE was observed at a GO content of 0.5 wt%, and a decrease in the ECE was confirmed at higher levels. The increase in ECE was confirmed by measuring short circuit current density (Jsc) and shunt resistance which increased with the GO addition. However, when an excessive amount of GO content was added, a decrease in the ECE was observed, due to the decrease in Jsc by the reduction in transmittance. In particular, an increase in the perovskite crystal size caused an increase in the ECE, due to the increased rms of TiO2 at 0.5 wt% GO. With the 0.7 wt% GO TiO2 layer, the perovskite grain size was decreased by the reduction in rms, and this resulted in a decrease in Jsc and ECE. These results suggest that we might improve the efficiency of perovskite solar cells by adding the proper amount of GO to the TiO2 layer.

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