[논문]페로브스카이트 실내 광전변환 효율 향상을 위한 ethylenediamine 기반의 표면 결함 부동화 연구

강석범; 윤주웅; 김창용; 이상헌; 이혜민; 김동회

doi:10.21218/cpr.2023.11.3.087

페로브스카이트 실내 광전변환 효율 향상을 위한 ethylenediamine 기반의 표면 결함 부동화 연구
Ethylenediamine Based Surface Defect Passivation for Enhancing Indoor Photovoltaic Efficiency of Perovskite 원문보기

Current photovoltaic research = 한국태양광발전학회논문지, v.11 no.3, 2023년, pp.87 - 95

강석범 (신소재공학과, 고려대학교) , 윤주웅 (신소재공학과, 고려대학교) , 김창용 (신소재공학과, 고려대학교) , 이상헌 (신소재공학과, 고려대학교) , 이혜민 (신소재공학과, 고려대학교) , 김동회 (신소재공학과, 고려대학교)

Abstract ▼ AI-Helper

As the demand for the Internet of Things grows, research into indoor photovoltaics for wireless power is becoming important. In particular, perovskite has attracted considerable attention due to its superior performance compared to other candidates. However, various surface defects present in perovskite are a limiting factor for high performance. In particular, deep-level surface defects caused by uncoordinated Pb2+ ions directly limit charge transport. In low light environments, this appears to be a more significant hurdle. In this study, ethylenediamine, which can provide covalent bonding to uncoordinated Pb2+ ions through nitrogen, was used as a surface treatment material for indoor photovoltaics. X-ray photoelectron spectroscopy confirmed that the uncoordinated Pb2+ ions were effectively passivated by the terminal nitrogen of ethylenediamine. As a consequence, a VOC of 0.998 V, a JSC of 0.139 mA cm-2 and a fill factor of 83.03% were achieved, resulting in an indoor photoelectric conversion efficiency of 38.02%.

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표/그림 (6)

그림 Fig. 1. Material properties of perovskite films with different surface treatment concentrations of EDA (0.3, 0.5 and 1.0 mM). (a) Top-view SEM images, (b) XRD patterns and (c) Absorption spectrums of perovskite films
그림 Fig. 2. Surface analysis via XPS with different EDA surface treatment concentrations (0.3, 0.5 and 1.0 mM). (a) Chemical structures of FAI, MAI, and EDA molecules. XPS spectrum of (b) N 1s, (c) C 1s, (d) Pb 4f of XPS spectrum and fitting data of perovskite film with different concentrations of EDA surface treatment. (e) Schematic diagram of uncoordinated Pb²⁺ defect passivation mechanism by EDA
그림 Fig. 3. Comparison of indoor photovoltaic performances with different EDA surface treatment concentrations (0.3, 0.5 and 1.0 mM). (a) Cross-section SEM image of indoor photovoltaic cell (b) J-V curves and (c) box plot of photovoltaic parameters at LED(2700 K, 1000 lux). (d) EQE spectrums and integrated J_SC with different EDA surface treatment concentrations.
그림 Fig. 4. Indoor light based light intensity dependence of V_OC with and without EDA surface treatment
표 Table 1. Photovoltaic parameters of indoor photovoltaic cells with different concentrations of EDA surface treatment (0.3, 0.5 and 1.0 mM)
그림 Fig. 5. Effects of surface defect passivation with EDA treatment. (a) Cross-section SEM image of electron only device without and with EDA treatment. (b) Pulsed SCLC measurement of the electron only devices without and with EDA treatment

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