Printable CsPbI3 Perovskite Solar Cells with PCE of 19% via an Additive Strategy. Issue 40 (31st August 2020)

• Record Type: Journal Article
• Authors: Chang, Xiaoming; Fang, Junjie; Fan, Yuanyuan; Luo, Tao; Su, Hang; Zhang, Yalan; Lu, Jing; Tsetseris, Leonidas; Anthopoulos, Thomas D.; Liu, Shengzhong (Frank); Zhao, Kui
• Is Part Of: Advanced materials. Volume 32:Issue 40(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-31
• Subjects: CsPbI 3 perovskite solar cells -- energy alignment -- passivation -- printable devices; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202001243
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: All‐inorganic CsPbI3 holds promise for efficient tandem solar cells, but reported fabrication techniques are not transferrable to scalable manufacturing methods. Herein, printable CsPbI3 solar cells are reported, in which the charge transporting layers and photoactive layer are deposited by fast blade‐coating at a low temperature (≤100 °C) in ambient conditions. High‐quality CsPbI3 films are grown via introducing a low concentration of the multifunctional molecular additive Zn(C6 F5 )2, which reconciles the conflict between air‐flow‐assisted fast drying and low‐quality film including energy misalignment and trap formation. Material analysis reveals a preferential accumulation of the additive close to the perovskite/SnO2 interface and strong chemisorption on the perovskite surface, which leads to the formation of energy gradients and suppressed trap formation within the perovskite film, as well as a 150 meV improvement of the energetic alignment at the perovskite/SnO2 interface. The combined benefits translate into significant enhancement of the power conversion efficiency to 19% for printable solar cells. The devices without encapsulation degrade only by ≈2% after 700 h in air conditions. Abstract : The development of the first high‐performance, printable CsPbI3 solar cells via an ambient blade‐coating technique is reported. High‐quality CsPbI3 films are grown via the introduction of a low concentration of the multifunctional molecular additive Zn(C6 F5 )2 . As a result, the additive‐treated perovskite solar cell delivers a power conversion efficiency (PCE) of 19%.