Low-temperature processed natural hematite as an electron extraction layer for efficient and stable perovskite solar cells

被引:5
作者
Qureshi, Akbar Ali [1 ,2 ,3 ]
Javed, Sofia [1 ]
Fakharuddin, Azhar [3 ]
Akram, Muhammad Aftab [4 ]
Schmidt-Mende, Lukas [3 ]
机构
[1] Natl Univ Sci & Technol, Sch Chem & Mat Engn, Islamabad 44000, Pakistan
[2] Bahauddin Zakariya Univ, Dept Mech Engn, Multan 60000, Pakistan
[3] Univ Konstanz, Dept Phys, D-78464 Constance, Germany
[4] Inst Appl Sci & Technol, Dept Mat Sci & Engn, Pak Austria Fachhsch, Haripur 22650, Pakistan
关键词
Natural alpha-Fe2O3; Electron extraction layer; Interfacial recombination; STABILITY;
D O I
10.1016/j.surfin.2023.103003
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The mixed halide perovskite solar cells (PSC) have manifested as a contender to market-dominating silicon counterparts owing to their low-temperature solution processing and high efficiency. In PSCs, the electron extraction layer (EEL) plays a vital role as it controls charge transport/extraction from the perovskite absorber layer to the EEL and also determines interfacial recombination and charge accumulation at the EEL/perovskite interface. In this work, high-purity natural hematite (alpha-Fe2O3) is reported for the first time as the EEL in triplecation perovskite (CsFAMA) solar cells. To show the cost-effectiveness of this novel EEL, the entire device fabrication process was carried out at a temperature below 150 degrees C. The optimal alpha-Fe2O3 EEL shows a mobility value of 9.5 x 10(-4) cm(-2) V-1 s(-1) and trap densities of around 2.40 x 10(16) cm(-3); the latter is close to state-of-theart SnO2 EEL (1.26 x 10(16) cm(-3)). The PSCs employing optimal EEL concentration of 10 mg/mL demonstrated a power conversion efficiency (PCE) of 13.3 %, fill factor of 68 %, and VOC of 1.03 V. X-ray diffraction studies show a high crystallinity of natural hematite whereas the photoluminescence studies show a fast carrier extraction from the perovskite to the EEL. The natural alpha-Fe2O3-based PSCs exhibited superior shelf-life stability of over 30 days due to less charge recombination and smoother CsFAMA thin film deposited over alpha-Fe2O3 EEL. The lowtemperature processed natural alpha-Fe2O3 EEL can therefore be a promising EEL material for low-cost efficient PSCs.
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页数:9
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