Abstract
AbstractThe emerging CsPbI3 perovskites are highly efficient and thermally stable materials for wide‐band gap perovskite solar cells (PSCs), but the doped hole transport materials (HTMs) accelerate the undesirable phase transition of CsPbI3 in ambient. Herein, a dopant‐free D‐π‐A type HTM named CI‐TTIN‐2F has been developed which overcomes this problem. The suitable optoelectronic properties and energy‐level alignment endow CI‐TTIN‐2F with excellent charge collection properties. Moreover, CI‐TTIN‐2F provides multisite defect‐healing effects on the defective sites of CsPbI3 surface. Inorganic CsPbI3 PSCs with CI‐TTIN‐2F HTM feature high efficiencies up to 15.9 %, along with 86 % efficiency retention after 1000 h under ambient conditions. Inorganic perovskite solar modules were also fabricated that exhibiting an efficiency of 11.0 % with a record area of 27 cm2. This work confirms that using efficient dopant‐free HTMs is an attractive strategy to stabilize inorganic PSCs for their future scale‐up.
Highlights
Hybrid organic-inorganic perovskite solar cells (PSCs) have demonstrated remarkable progress in power conversion efficiencies (PCEs) from 3.8 % to 25.5 % in the past several years, showing their great potential in next-generation lowcost photovoltaic technology.[1]
Note that the position of the intramolecular charge transfer (ICT) band is slightly red-shifted as the solution transitions to the solid-state, which is characteristic of many organic semiconductors.[19]
The CsPbI3 PSC with CI-TTIN-2F maintains over 80 % of the initial PCE under light soaking for 800 h, demonstrating a superior photochemical stability based on this new CI-TTIN-2F hole transport materials (HTMs)
Summary
Hybrid organic-inorganic perovskite solar cells (PSCs) have demonstrated remarkable progress in power conversion efficiencies (PCEs) from 3.8 % to 25.5 % in the past several years, showing their great potential in next-generation lowcost photovoltaic technology.[1]. Angewandte Chemie International Edition published by Wiley-VCH GmbH Chemie must be a few nanometers to maintain charge extraction from the active layers to the charge transport layers.[13] For these reasons, highly hydrophobic hole transport materials (HTMs) have received attention, as they have the potential to block the moisture-driven phase transition of black phase CsPbI3.[14]. The device employing CI-TTIN-2F maintains over 86 % of its initial performance for 1000 h after storage in ambient conditions
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