High-performance carbon-based all-inorganic CsPbI2Br perovskite solar cells via ethylammonium iodide and phenethylammonium iodide synergistic passivation

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. , …”

Forming a composite electron blocking layer to enhance the performance of carbon-based CsPbI3 perovskite solar cells

“…11,35 To suppress the electron back transport, forming an electron blocking layer at the CsPbI 3 /carbon interface has been employed. [36][37][38] For example, phenylethylamine iodide (PEAI) 39 or CsCl 40 have been used to treat the CsPbI 3 layer to grow a 2D perovskite layer in situ acting as an electron blocking layer. However, the performance improvement is still limited for a single electron blocking layer and a new strategy is needed.…”

Inorganic CsPbI2Br halide perovskites: from fundamentals to solar cell optimizations

“…Benefitting from these, a PCE of 13.76% (a J SC of 14.59 mA cm −2 , a V OC of 1.17 V and a FF of 0.803) with outstanding stability was obtained for the device under investigation. 100 In addition to EAI and PEAI, fluorinated derivatives of 4-fluorophenylethylammonium halides ( i.e. 4-fluorophenylethylammonium iodide (P-F-PEAI) and 4- fluorophenylethylammonium bromide (P-F-PEABr) have also been used to modify the CsPbI 2 Br film surface for C-CsPbI 2 Br PSCs.…”

“…A higher PCE of 13.78% (a J SC of 14.74 mA cm À2 , a V OC of 1.26 V and a FF of 0.740) along with long-term stability was obtained for the device under investigation with TM. 97 On the other hand, ammonium-based passivation layers of hexyltrimethylammonium bromide (HTAB), 37 methylammonium bromide (MABr), 98 phenylethylammonium iodide (PEAI), 99 and ethylammonium iodide (EAI) + PEAI 100 have also been applied at the CsPbI 2 Br/ carbon interface for C-CsPbI 2 Br PSC application. With 0.001 M HTAB solution treatment on CsPbI 2 Br films, a higher PCE of 14.30% (a J SC of 14.10 mA cm À2 , a V OC of 1.26 V and a FF of 0.806) was obtained for the device under investigation.…”