High-Purity, Thick CsPbCl₃ Films toward Selective Ultraviolet-Harvesting Visibly Transparent Photovoltaics

Abstract

Inorganic lead halide perovskite CsPbCl 3 with an absorption edge of ∼420 nm and exceptional optoelectronic properties is promising for selective ultraviolet (UV)harvesting visibly transparent photovoltaics. However, the low solubilities of CsCl and PbCl 2 precursor materials in common solvents make it difficult to prepare high-quality CsPbCl 3 films with the desired thickness. Herein, we demonstrate a water-assisted two-step spin coating growth strategy for CsPbCl 3 films. Because of the high solubility of CsCl but the low solubility of PbCl 2 in water, it becomes possible to produce CsPbCl 3 films by direct spin coating of CsCl/H 2 O solution onto a PbCl 2 film without damaging it. After optimizing the dose of CsCl/H 2 O solution, CsPbCl 3 films with a full surface coverage, pure perovskite phase, high crystallinity, large average grain size of 620 nm, and thickness of ∼310 nm are obtained. Consequently, the selective UV-harvesting visibly transparent PSCs with the CsPbCl 3 films yield an optimized efficiency of 1.19%, an average visible transparency of 53.1%, and a color rendering index of 91.1. The findings of our study make it clear that the water-assisted twostep spin coating growth strategy is highly feasible to prepare CsPbCl 3 films with desired characters, and thus, it has a great potential in the future development of CsPbCl 3 optoelectronic devices.

MXene-Integrated Metal Oxide Transparent Photovoltaics and Self-Powered Photodetectors

“…Transparent photovoltaic devices (TPVDs) can have a significant impact on emerging optoelectronics. − Unlike conventional opaque photovoltaics, TPVDs convert incident light to electric power without blocking human vision, which enables their integration into windows of displays, vehicles, and buildings as invisible power suppliers. This greater use of photovoltaics in daily life contributes to the ultimate development of a sustainable energy platform. , …”

Tunable Photovoltaics: Adapting Solar Cell Technologies to Versatile Applications

“…[377] (Figure 9a) Selective ultraviolet (UV)-harvesting visibly transparent photovoltaics can be also realized using CsPbCl 3 with an absorption edge of ≈420 nm, resulting in an efficiency of 1.19%, and a CRI of 91, but, suffer from moderate AVT of 53.1%. [381] Another approach to realize colorless TPV is the adoption of concepts with NIR-harvesting from the long-wavelength side of the solar spectrum using low-bandgap polymer donors and small molecular acceptors as organic photoactive materials. [64,65] A proof-of-concept of NIR-selective organic TPV was realized in 2011, featuring peak absorption beyond 650 nm.…”

“…[ 377 ] ( Figure 9 a) Selective ultraviolet (UV)‐harvesting visibly transparent photovoltaics can be also realized using CsPbCl 3 with an absorption edge of ≈420 nm, resulting in an efficiency of 1.19%, and a CRI of 91, but, suffer from moderate AVT of 53.1%. [ 381 ]…”

MAPbCl3 Light Absorber for Highest Voltage Perovskite Solar Cells

“…Figure 3d summarizes the achieved V OC 's of Cl-based PSCs using spiro-OMeTAD as an HTL in the literature. 17,43,44 Annealing in MACl vapor atmosphere yields a record V OC of 1.78 V for MAPbCl 3 ; however a V OC deficit of 900 mV compared to the theoretical limit of 2.69 V still exists. 14 In comparison to narrow-bandgap perovskites (≤1.6 eV), bulk and interfacial non-radiative losses are a challenge for widebandgap perovskites (>2.0 eV), which leads to their diminished photovoltaic performance significantly below the maximum theoretical potential.…”

“…Statistics of photovoltaic parameters along with their standard deviation are summarized in Table S1. Figure d summarizes the achieved V OC ’s of Cl-based PSCs using spiro-OMeTAD as an HTL in the literature. ,, …”