Interface Engineering for All‐Inorganic CsPbI₂Br Perovskite Solar Cells with Efficiency over 14%

Abstract

In this work, a SnO /ZnO bilayered electron transporting layer (ETL) aimed to achieve low energy loss and large open-circuit voltage (V ) for high-efficiency all-inorganic CsPbI Br perovskite solar cells (PVSCs) is introduced. The high-quality CsPbI Br film with regular crystal grains and full coverage can be realized on the SnO /ZnO surface. The higher-lying conduction band minimum of ZnO facilitates desirable cascade energy level alignment between the perovskite and SnO /ZnO bilayered ETL with superior electron extraction capability, resulting in a suppressed interfacial trap-assisted recombination with lower charge recombination rate and greater charge extraction efficiency. The as-optimized all-inorganic PVSC delivers a high V of 1.23 V and power conversion efficiency (PCE) of 14.6%, which is one of the best efficiencies reported for the Cs-based all-inorganic PVSCs to date. More importantly, decent thermal stability with only 20% PCE loss is demonstrated for the SnO /ZnO-based CsPbI Br PVSCs after being heated at 85 °C for 300 h. These findings provide important interface design insights that will be crucial to further improve the efficiency of all-inorganic PVSCs in the future.

Band Alignment Engineering Towards High Efficiency Carbon‐Based Inorganic Planar CsPbIBr2 Perovskite Solar Cells

“…Figure 5e gives the Nyquistp lots of the cells with TiO 2 and TiO 2 / CsBr ETLs at af orwardb ias of 1V under dark condition. [8,36,43,44] The cell with TiO 2 /CsBr yields larger R rec than the cell with TiO 2 ,i ndicative of al ower recombination rate. [8,36,43,44] The cell with TiO 2 /CsBr yields larger R rec than the cell with TiO 2 ,i ndicative of al ower recombination rate.…”

“…[23,[34][35][36] In general,i nterface recombination in PSCs depends not only on interfaciald efects, but also more importantly on the interfacial bands tructure, [37,38] which is both theoretically supported and experimentally demonstrated. [23,[34][35][36] In general,i nterface recombination in PSCs depends not only on interfaciald efects, but also more importantly on the interfacial bands tructure, [37,38] which is both theoretically supported and experimentally demonstrated.…”

Boosting the Performance of Environmentally Friendly Quantum Dot‐Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure

“…As shown in Figure 3d, the band alignment of ZCIS, ZCISe, and TiO 2 creates a cascade energy band structure. [27][28][29][30] It was demonstrated that the cascade energy level can not only facilitate the extraction of photogenerated electrons and holes but also suppress charge recombination loss at the interface. This stepwise transfer process for electrons can be further verified by the photoluminescence (PL) emission spectrum analysis as shown in Figure S5 (Supporting Information).…”

Anorganische CsPbX3‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

“…[186] Nanoschicht-QDs oder dimensionsabgestufte 3D-2D-0D-Grenzflächen erzeugen ein elektrisches Feld auf der Rückseite der PSC,d as die Ladungsträgerextraktion fçrdert und einen hçheren Stromfluss verursacht (Abbildung 9b). [184] Copyright 2018, Wiley-VCH. [188] Alle diese Verfahren (kombiniert in Lit.…”