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Shin D, Kang D, Jeong J, Park S, Kim M, Lee H, Yi Y. Unraveling the Charge Extraction Mechanism of Perovskite Solar Cells Fabricated with Two-Step Spin Coating: Interfacial Energetics between Methylammonium Lead Iodide and C 60. J Phys Chem Lett 2017; 8:5423-5429. [PMID: 29057656 DOI: 10.1021/acs.jpclett.7b02562] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In organolead halide perovskite solar cells (PSCs), interfacial properties between the perovskite and charge transport layers are the critical factors governing charge extraction efficiency. In this study, the effect of interfacial energetics between two-step spin-coated methylammonium lead iodide (MAPbI3) with different methylammonium iodide (MAI) concentrations and C60 on the charge extraction efficiency is investigated. The electronic structures of perovskite films are significantly varied by the MAI concentrations due to the changes in the residual precursor and MA+ defect content. As compared to the optimum PSCs with 25 mg mL-1 MAI, PSCs with other MAI concentrations show significantly lower power conversion efficiencies and severe hysteresis. The energy level alignment at the C60/MAPbI3 interface determined by ultraviolet and inverse photoelectron spectroscopy measurements reveals the origin of distinct differences in device performances. The conduction band offset at the C60/MAPbI3 interface plays a crucial role in efficient charge extraction in PSCs.
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Affiliation(s)
- Dongguen Shin
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Donghee Kang
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Junkyeong Jeong
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Soohyung Park
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Minju Kim
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
| | - Hyunbok Lee
- Department of Physics, Kangwon National University , 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
| | - Yeonjin Yi
- Institute of Physics and Applied Physics, Yonsei University , 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
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Sadollahkhani A, Liu P, Leandri V, Safdari M, Zhang W, Gardner JM. Energetic Barriers to Interfacial Charge Transfer and Ion Movement in Perovskite Solar Cells. Chemphyschem 2017; 18:3047-3055. [DOI: 10.1002/cphc.201700740] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/17/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Azar Sadollahkhani
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
| | - Peng Liu
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
| | - Valentina Leandri
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
| | - Majid Safdari
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
| | - Wei Zhang
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
| | - James M. Gardner
- Division of Applied Physical Chemistry; Department of Chemistry; KTH Royal Institute of Technology; 100 44 Stockholm Sweden
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Agresti A, Pescetelli S, Taheri B, Del Rio Castillo AE, Cinà L, Bonaccorso F, Di Carlo A. Graphene-Perovskite Solar Cells Exceed 18 % Efficiency: A Stability Study. CHEMSUSCHEM 2016; 9:2609-2619. [PMID: 27629238 DOI: 10.1002/cssc.201600942] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Indexed: 05/20/2023]
Abstract
Interface engineering is performed by the addition of graphene and related 2 D materials (GRMs) into perovskite solar cells (PSCs), leading to improvements in the power conversion efficiency (PCE). By doping the mesoporous TiO2 layer with graphene flakes (mTiO2 +G), produced by liquid-phase exfoliation of pristine graphite, and by inserting graphene oxide (GO) as an interlayer between the perovskite and hole-transport layers, using a two-step deposition procedure in air, we achieved a PCE of 18.2 %. The obtained PCE value mainly results from improved charge-carrier injection/collection with respect to conventional PSCs. Although the addition of GRMs does not influence the shelf life, it is beneficial for the stability of PSCs under several aging conditions. In particular, mTiO2 +G PSCs retain more than 88 % of the initial PCE after 16 h of prolonged 1 sun illumination at the maximum power point. Moreover, when subjected to prolonged heating at 60 °C, the GO-based structures show enhanced stability with respect to mTiO2 +G PSCs, as a result of thermally induced modification at the mTiO2 +G/perovskite interface. The exploitation of GRMs in the form of dispersions and inks opens the way for scalable large-area production, advancing the possible commercialization of PSCs.
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Affiliation(s)
- Antonio Agresti
- C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Rome, Italy
| | - Sara Pescetelli
- C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Rome, Italy
| | - Babak Taheri
- C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Rome, Italy
| | | | - Lucio Cinà
- C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Rome, Italy
| | - Francesco Bonaccorso
- Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, 16163, Genova, Italy
| | - Aldo Di Carlo
- C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133, Rome, Italy.
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