Interface Modification with CuCrO₂ Nanocrystals for Highly Efficient and Stable Planar Perovskite Solar Cells

Abstract

The interfaces between the absorber and charge transport layers are shown to be critical for the performance of perovskite solar cells (PSCs). PSCs based on the Spiro-OMeTAD hole transport layers generally suffer from the problems of stability and reproducibility. Inorganic hole transport materials CuCrO 2 have good chemical stability and high hole mobility. Herein, we reported the preparation of the delafossite-type CuCrO 2 nanocrystals with a template-etching-calcination method and the incorporation of the as-obtained CuCrO 2 nanocrystals at the perovskite/ Spiro-OMeTAD interfaces of planar PSCs to improve the device efficiency and stability. Compared with the traditional hydrothermal method, the template-etchingcalcination method used less calcination time to prepare CuCrO 2 nanocrystals. After the CuCrO 2 interface modification, the efficiency of PSCs improved from 18.08% to 20.66%. Additionally, the CuCrO 2 -modified PSCs showed good stability by retaining nearly 90% of the initial PCE after being stored in a drybox for 30 days. The template-etching-calcination strategy will pave a new approach for the synthesis of high-performance inorganic hole-transporting materials.

Surface Passivation of CsPbI 3 Films for Efficient and Stable Hole-Transporting Layer-Free Carbon-Based Perovskite Solar Cells

“…But for the commercial application of PSCs, long-term stability is as equally important as device efficiency. Till now, highly efficient PSCs are based on organic–inorganic hybrid perovskites, which consist of thermolabile organic cations (e.g., methylammonium (MA), formamidinium (FA)), hindering their further development for commercialization. − To address this issue, inorganic perovskites employing Cs + as an A-site cation are developed, which have been demonstrated to be an efficient component for constructing highly efficient PSCs. − Among all of the reported inorganic perovskites, the CsPbI 3 perovskite possesses a suitable band gap ( E g : ∼1.7 eV) as well as decent phase stability and is considered as the most promising candidate for commercial application. − Actually, the PCE of the best-performing CsPbI 3 -based PSCs has exceeded 21% and is in a rapid growth stage currently. , …”

Electron transport layer assisted by nickel chloride hexahydrate for open-circuit voltage improvement in MAPbI3 perovskite solar cells

“…To study the carrier transport in PSCs, steady-state fluorescence spectroscopy (PL) experiments were performed on the perovskite films on SnO 2 and SnO 2 –NiCl 2 substrates. 47,48 As shown in Fig. 3a, carrier quenching was slower for the samples on the SnO 2 –NiCl 2 substrates, which is detrimental to increasing J SC of the solar cell.…”

Effect of novel graphitic carbon/NiO hole transporting electrode on the photovoltaic and optical performance of semi-transparent perovskite solar cells

“…[26][27][28][29][30][31][32][33] So far, various carbon polymorphs and composites have been used for PSCs as counter electrodes. [34][35][36][37][38][39][40] The property of the counter electrode is highly crucial to determine the semi-transparent nature of PSCs as well. [41][42][43][44][45][46] In this context, maintaining healthy optical and photovoltaic characters using carbonbased electrodes can be a game-changer that has not been thoroughly explored to date.…”