Combined Experimental and Simulation Studies of Lithium and Cobalt-Modified TiO2 and Their Impacts on the Performance and Stability of Perovskite Solar Cells

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Smerchit, Thapanut; Thongprong, Non; Ruengsrisang, Waranchit; Adam, Ibrahim Muhammad; Soe, Kay Thi;
Thansamai, Somya; Chanlek, Narong; Nakajima, Hideki; Supruangnet, Ratchadaporn; Saetang, Viboon;
Kaewprajak, Anusit; Supasai, Thidarat; Rujisamphan, Nopporn;

ผู้เผยแพร่: Wiley Open Access

ปีที่เผยแพร่ (ค.ศ.): 2022

ชื่อย่อของวารสาร: Adv. Mater. Interfaces

Volume number: 9

Issue number: 31

นอก: 2196-7350

eISSN: 2196-7350

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85139252939&doi=10.1002%2fadmi.202201632&partnerID=40&md5=0b6d1e9fd9d4e114d7adbede45317b8b

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Posttreatment of titanium oxide (TiO2) using lithium (Li) and cobalt (Co) precursors is widely adopted to modify the charge quenching property in perovskite solar cells (PSCs); however, the fundamental understanding of the effect of the modification layer on the material itself and, consequently, the photovoltaic performance stability is not complete. In this work, in situ X-ray diffraction measurements show that the Li and Co ions can diffuse into TiO2 and consequently accelerate the rutile phase transformation. X-ray photoelectron spectroscopy results reveal the appearance of a Ti3+ feature in both the Li- and Co-treated samples, suggesting that the treatment ions are partially located at the subsurface/surface of the spin-cast TiO2 layer. The Li-treated TiO2 exhibits greatly upshifted conduction band edges, which benefits charge extraction properties and improves the average device parameters in a complete PSC. To complement the experiments, density functional theory calculations are performed. While Li treatment initially results in enhanced electronic properties, Li-treated TiO2 tends to have more surface vacancies over time and is more susceptible to adsorption and accumulation of iodide ions compared to the Co-treated sample, which is experimentally supported by surface photovoltage spectroscopy and time-resolved photoluminescence results. © 2022 Wiley-VCH GmbH.

คำสำคัญ

charge separation, density functional theory simulations, Li/Co-treatments