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      Carrier Dynamics Determines the Optimization Strategies of Perovskite LEDs and PVs

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      Author(s): 1 , 1 , 2 , 1 , * , , 1 , 2 , * , , 1 , * ,
      Publication date (Electronic, pub):
      Publication date (Electronic, collection):
      Journal: Research
      Publisher: AAAS

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          Abstract

          Metal halide perovskites have advanced greatly in both light-emitting diodes (LEDs) and photovoltaics (PVs) through delicate device engineering. The optimization strategies of perovskite LEDs and PVs have been demonstrated to be quite different. Here, we show that this dissimilarity in device fabrications can be well understood based on the analysis of carrier dynamics in LEDs and PVs.

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          Organometal halide perovskites as visible-light sensitizers for photovoltaic cells.

          Akihiro Kojima, Kenjiro Teshima, Yasuo Shirai … (2009)
          Two organolead halide perovskite nanocrystals, CH(3)NH(3)PbBr(3) and CH(3)NH(3)PbI(3), were found to efficiently sensitize TiO(2) for visible-light conversion in photoelectrochemical cells. When self-assembled on mesoporous TiO(2) films, the nanocrystalline perovskites exhibit strong band-gap absorptions as semiconductors. The CH(3)NH(3)PbI(3)-based photocell with spectral sensitivity of up to 800 nm yielded a solar energy conversion efficiency of 3.8%. The CH(3)NH(3)PbBr(3)-based cell showed a high photovoltage of 0.96 V with an external quantum conversion efficiency of 65%.
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            Surface passivation of perovskite film for efficient solar cells

            Qi Jiang, Yang Zhao, Xingwang Zhang … (2019)
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              Sequential deposition as a route to high-performance perovskite-sensitized solar cells.

              Julian Burschka, Norman Pellet, Soo-Jin Moon … (2013)
              Following pioneering work, solution-processable organic-inorganic hybrid perovskites-such as CH3NH3PbX3 (X = Cl, Br, I)-have attracted attention as light-harvesting materials for mesoscopic solar cells. So far, the perovskite pigment has been deposited in a single step onto mesoporous metal oxide films using a mixture of PbX2 and CH3NH3X in a common solvent. However, the uncontrolled precipitation of the perovskite produces large morphological variations, resulting in a wide spread of photovoltaic performance in the resulting devices, which hampers the prospects for practical applications. Here we describe a sequential deposition method for the formation of the perovskite pigment within the porous metal oxide film. PbI2 is first introduced from solution into a nanoporous titanium dioxide film and subsequently transformed into the perovskite by exposing it to a solution of CH3NH3I. We find that the conversion occurs within the nanoporous host as soon as the two components come into contact, permitting much better control over the perovskite morphology than is possible with the previously employed route. Using this technique for the fabrication of solid-state mesoscopic solar cells greatly increases the reproducibility of their performance and allows us to achieve a power conversion efficiency of approximately 15 per cent (measured under standard AM1.5G test conditions on solar zenith angle, solar light intensity and cell temperature). This two-step method should provide new opportunities for the fabrication of solution-processed photovoltaic cells with unprecedented power conversion efficiencies and high stability equal to or even greater than those of today's best thin-film photovoltaic devices.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Research (Wash D C)
                Journal ID (iso-abbrev): Research (Wash D C)
                Journal ID (publisher-id): RESEARCH
                Title: Research
                Publisher: AAAS
                ISSN (Electronic): 2639-5274
                Publication date (Electronic, pub): 11 April 2023
                Publication date (Electronic, collection): 2023
                Volume: 6
                Electronic Location Identifier: 0112
                Affiliations
                [ 1 ]Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM) & School of Flexible Electronics (Future Technologies) , Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
                [ 2 ]Strait Laboratory of Flexible Electronics (SLoFE), Strait Institute of Flexible Electronics (SIFE, Future Technologies), Fujian Normal University, Fuzhou 350117, China.
                Author notes
                Article
                Publisher ID: 0112
                DOI: 10.34133/research.0112
                PMC ID: 10202179
                PubMed ID: 37223460
                SO-VID: 1e437b9d-1c16-4cad-ad26-4732afbfb01b
                Copyright statement: Copyright @ 2023
                License:

                Exclusive Licensee Science and Technology Review Publishing House. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY 4.0).

                History
                Date received : 08 February 2023
                Date accepted : 17 March 2023
                Date: 11 April 2023
                Page count
                Figures: 1, Tables: 0, References: 17, Pages: 0
                Categories
                Subject: Perspective

                Data availability:

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