Electroluminescent Solar Cells Based on CsPbI₃ Perovskite Quantum Dots

Abstract

All‐inorganic CsPbX3 (X = Cl, Br, I, or mixed halides) perovskite quantum dots (QDs) exhibit tunable optical bandgaps and narrow emission peaks, which have received worldwide interest in the field of both photovoltaics (PVs) and light‐emitting diodes (LEDs). Herein, it is reported a discovery that CsPbI3 perovskite QD solar cell can simultaneously deliver high PV performance and intense electroluminescence. In specific, the multifunctional CsPbI3 QD film is fabricated through a simple yet efficient solid‐state‐ligand exchange process using a tailored organic ligand triphenyl phosphite (TPPI). The function of QD surface manipulation using TPPI here is proven to be twofold, balancing the carrier transport and effectively passivating the QD surface to produce conductive and emissive QD film. The CsPbI3 perovskite QD solar cell delivers a champion efficiency of 15.21% with improved open circuit voltage and high fill factor. Concurrently functioning as a red LED, the CsPbI3 perovskite QD solar cell outputs electric power to light conversion efficiency approaching 4%, a record value for QD electroluminescent PVs. The results here indicate that these versatile perovskite QDs may be a promising candidate for fabricating multifunctional optoelectronic devices.

Zn-derived ligand engineering towards stable and bright CsPbI3 nanocrystals for white emitting

“…In the past few years, lead halide perovskite (LHP) nanocrystals (NCs) have been found to possess excellent photoelectric properties such as low synthesis cost, good defect tolerance, high photoluminescence quantum yields (PLQYs) and tunable band gaps. 1–5 Therefore, they have attracted wide attention in many fields such as photovoltaics, 6,7 light-emitting diodes (LEDs), photodetectors, and biological imaging. 8–15 The general structure formula of LHP NCs is ABX 3 (A = Cs + /CH 3 NH 3 + /CH 3 (NH 2 ) 2 + , B = Pb 2+ , X = Cl − /Br − /I − ).…”

Colloidal Quantum Dot Solar Cells: Progressive Deposition Techniques and Future Prospects on Large‐Area Fabrication

“…This may explain the continued reliance on spin coating to the near exclusion of all other coating methods as shown in Table 3. [128][129][130][131][132][133][134][135][136][137][138][139][140][141][142][143][144][145] However, it should be noted that, compared to PQD-based solar cells, there are many reports of deposition techniques other than spin-coating for PbS/PbSe CQD-based solar cells, as demonstrated in Figure 7. The liquid phase ligand exchange process has been well-established for metal chalcogenide based CQDs, which allows the whole QD absorber layer to be produced by a single-step deposition using colloidal short-chain-ligandcapped QD inks without any requirement of post-deposition ligand exchange.…”

Strategies for highly efficient and stable cesium lead iodide perovskite photovoltaics: mechanisms and processes

“…Recently, Wang and coworkers prepared high quality CsPbI 3 QDs by adding a tailored organic ligand triphenyl phosphite (TPPI) into MeOAc solution, and achieved amazing results. 142 This bulky conductive ligand exhibits strong bonding to the QD surface and further balances the carrier transport. As a result, the electrical coupling between CsPbI 3 QDs is enhanced, leading to improved charge transport, reduced carrier recombination, and then simultaneously high V OC (1.23 V) and fill factor (79.45%) values.…”