期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 9, 页码 8824-8831出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00928
关键词
perovskite solar cells; graphene oxide; hole-transporting material; flexible perovskite solar cells; bifacial perovskite solar cells; stability; barrier layer
资金
- LG Display under the LGDSNU incubation Program
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [NRF-2021M3H4A1A03057403, NRF2017M1A2A2087398]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20193091010310]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20193091010310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A thin graphene oxide layer has been developed as a hole transport layer for transparent and flexible p-i-n-type perovskite solar cells, showing high efficiency and good long-term stability. The GO layer demonstrates excellent hole-extracting capabilities and uniform coverage on the substrate, leading to enhanced device stability compared to conventional PEDOT:PSS-based counterparts.
A thin graphene oxide (GO) layer has been prepared on indium tin oxide (ITO)-coated glass and plastic (polyethylene naphthalate; PEN) substrates for the application as a hole transport layer (HTL) of p-i-n-type planar perovskite solar cells. Transparent devices can be fabricated by replacing the Ag top electrode of conventional nontransparent devices with an ITO top electrode using radio frequency (RF) sputtering. The GO layer with high transmittance in the visible range exhibits excellent hole-extracting capabilities from the perovskite layer. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses reveal that the GO HTL uniformly covers the substrate. In addition, the GO-based devices show significantly improved long-term stability compared with the conventional poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)-based counterparts. The enhancement in stability becomes much more apparent for flexible devices with the PEN substrate, which has been attributed to the excellent barrier properties of the GO HTL. As a result, a transparent and flexible p-i-n-type perovskite solar cell with a bifunctional GO HTL exhibits a high efficiency of 9.34% (cf. 11.39% for the glass substrate and 12.31% for the nontransparent/glass substrate) and good long-term stability.
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