A low-cost hole transport layer enables CsPbI2Br single-junction and tandem perovskite solar cells with record efficiencies of 17.8 % and 21.4 %

Recent progress in perovskite solar cells: material science

“…A high PCE of 21.2% with a high FF of 81.6% was achieved for the planar PSCs, and the devices showed great ambient and thermal stability. In 2022, Zhou et al [294] also used a dopant-free low-cost polymer PTQ10 as the HTM for PSCs and the interconnection layer for perovskite/organic tandem solar cells. Thanks to the better energy level matching between PTQ10 and CsPbI 2 Br and the perovskite surface passivation induced by the functional groups of PTQ10, the CsPbI 2 Br PSC with PTQ10 HTM achieves an optimal PCE of 17.8% with a high V oc of 1.4 V. In addition, the application of interconnection layer with PTQ10 HTM in monolithic CsPbI 2 Br/organic tandem cell also showed excellent optical and electrical properties.…”

Polar side-chain tuning of perylene diimide and fluorene-based cathode interfacial material for high-performance inverted perovskite solar cells

“…Interfacial engineering is one of the important strategies in the optimization of PVSCs because the interface of adjacent layers is crucial for charge collection and recombination. 1,4,9,10 In the inverted structure, the interface between the perovskite layer and cathode plays a dominant role in the photovoltaic performance and device stability, and therefore an electron transport layer (ETL) is needed to be introduced to eliminate the interfacial defect, facilitate the charge transfer and also passivate the perovskite layer. 11–16 The most common and successful ETL material is the fullerene derivative PCBM; however, the thin layer PCBM ETL suffers from obvious aggregations with large roughness and also has a large energy level barrier with the cathode ( i.e.…”

4-Terminal Inorganic Perovskite/Organic Tandem Solar Cells Offer 22% Efficiency

“…In 2019, we first reported 2-T inorganic perovskite/organic tandem solar cells [16], after which a series works were carried out [17][18][19][20][21][22][23]. A PCE of 21.4% has been achieved for 2-T inorganic perovskite/ organic tandem cells [24]. To date, very few works have been done about 4-T inorganic perovskite/organic tandem cells.…”