Triple A‐Site Cation Mixing in 2D Perovskite‐Inspired Antimony Halide Absorbers for Efficient Indoor Photovoltaics. Issue 4 (11th December 2022)

• Record Type: Journal Article
• Authors: Lamminen, Noora; Grandhi, Gopal Krishnamurthy; Fasulo, Francesca; Hiltunen, Arto; Pasanen, Hannu; Liu, Maning; Al‐Anesi, Basheer; Efimov, Alexander; Ali‐Löytty, Harri; Lahtonen, Kimmo; Mäkinen, Paavo; Matuhina, Anastasia; Muñoz‐García, Ana Belén; Pavone, Michele; Vivo, Paola
• Is Part Of: Advanced energy materials. Volume 13:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-11
• Subjects: 2D‐layered crystal structures -- antimony -- indoor photovoltaics -- perovskite‐inspired materials -- triple‐cation; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202203175
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Antimony‐based perovskite‐inspired materials (PIMs) are solution‐processable halide absorbers with interesting optoelectronic properties, low toxicity, and good intrinsic stability. Their bandgaps around 2 eV make them particularly suited for indoor photovoltaics (IPVs). Yet, so far only the fully inorganic Cs3 Sb2 Cl x I9− x composition has been employed as a light‐harvesting layer in IPVs. Herein, the first triple‐cation Sb‐based PIM (CsMAFA‐Sb) in which the A‐site of the A3 Sb2 X9 structure consists of inorganic cesium alloyed with organic methylammonium (MA) and formamidinium (FA) cations is introduced. Simultaneously, the X‐site is tuned to guarantee a 2D structure while keeping the bandgap nearly unchanged. The presence of three A‐site cations is essential to reduce the trap‐assisted recombination pathways and achieve high performance in both outdoor and indoor photovoltaics. The external quantum efficiency peak of 77% and the indoor power conversion efficiency of 6.4% are the highest values ever reported for pnictohalide‐based photovoltaics. Upon doping of the P3HT hole‐transport layer with F4‐TCNQ, the power conversion efficiency of CsMAFA‐Sb devices is fully retained compared to the initial value after nearly 150 days of storage in dry air. This work provides an effective compositional strategy to inspire new perspectives in the PIM design for IPVs with competitive performance and air stability. Abstract : The triple‐cation A3 Sb2 X9 ‐based perovskite‐inspired material (PIM), with cesium, methylammonium and formamidinium occupying its A‐site, possesses a suitable band gap for indoor photovoltaics (IPVs). Reduced trap‐assisted recombination and high external quantum efficiency of triple‐cation Sb‐based PIM IPVs ensure an indoor power conversion efficiency of 6.4%, which is the highest among pnictohalide based IPVs.