Title Co-evaporated MAPbI(3) with graded fermi levels enables highly performing, scalable, and flexible p-i-n perovskite solar cells /
Authors Li, Jia ; Dewi, Herlina Arianita ; Wang, Hao ; Zhao, Jiashang ; Tiwari, Nidhi ; Yantara, Natalia ; Malinauskas, Tadas ; Getautis, Vytautas ; Savenije, Tom J ; Mathews, Nripan ; Mhaisalkar, Subodh ; Bruno, Annalisa
DOI 10.1002/adfm.202103252
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Is Part of Advanced functional materials.. Weinheim : Wiley-VCH. 2021, vol. 31, iss. 42, art. no. 2103252, p. 1-11.. ISSN 1616-301X. eISSN 1616-3028
Keywords [eng] co-evaporated perovskites ; co-evaporation ; graded Fermi level ; large area ; perovskite solar cells ; p-i-n solar cells
Abstract [eng] Recent progress of vapor-deposited perovskite solar cells (PSCs) has proved the feasibility of this deposition method in achieving promising photovoltaic devices. For the first time, it is probed the versatility of the co-evaporation process in creating perovskite layers customizable for different device architectures. A gradient of composition is created within the perovskite films by tuning the background chamber pressure during the growth process. This method leads to co-evaporated MAPbI3 film with graded Fermi levels across the thickness. Here it is proved that this growth process is beneficial for p-i-n PSCs as it can guarantee a favorable energy alignment at the charge selective interfaces. Co-evaporated p-i-n PSCs, with different hole transporting layers, consistently achieve power conversion efficiency (PCE) over 20% with a champion value of 20.6%, one of the highest reported to date. The scaled-up p-i-n PSCs, with active areas of 1 and 1.96 cm2, achieved the record PCEs of 19.1% and 17.2%, respectively, while the flexible PSCs reached a PCE of 19.3%. Unencapsulated PSCs demonstrate remarkable long-term stability, retaining ≈90% of their initial PCE when stored in ambient for 1000 h. These PSCs also preserve over 80% of their initial PCE after 500 h of thermal aging at 85 °C. © 2021 Wiley-VCH GmbH.
Published Weinheim : Wiley-VCH
Type Journal article
Language English
Publication date 2021