High-performance photovoltaic perovskite layers fabricated through intramolecular exchange

Yang, Woon Seok; Noh, Jun Hong; Jeon, Nam Joong; Kim, Young Chan; Ryu, Seungchan; Seo, Jangwon; Seok, Sang Il

doi:10.1126/science.aaa9272

Cited by 5,603 publications

(4,510 citation statements)

References 24 publications

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“…For example, MAPbI 3 , the archetypal hybrid halide perovskite, possesses many ideal properties as a solar absorber: a direct bandgap ( E g ) of 1.53 eV,16 small exciton binding energies (37 or 45 meV),17, 18, 19 long charge carrier diffusion lengths over 3.5 µm,20, 21 and excellent charge carrier mobilities 22, 23, 24. Inherited all the merits of tribasic MAPbI 3 , the compositionally engineered polybasic 3D lead halide perovskite‐based PSCs exhibited a skyrocketing certified PCE from initial 14.9% to state‐of‐the‐art 22.1%25 within three years.…”

Section: Introductionmentioning

confidence: 99%

Lead‐Free Hybrid Perovskite Absorbers for Viable Application: Can We Eat the Cake and Have It too?

2017

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Many years since the booming of research on perovskite solar cells (PSCs), the hybrid perovskite materials developed for photovoltaic application form three main categories since 2009: (i) high‐performance unstable lead‐containing perovskites, (ii) low‐performance lead‐free perovskites, and (iii) moderate performance and stable lead‐containing perovskites. The search for alternative materials to replace lead leads to the second group of perovskite materials. To date, a number of these compounds have been synthesized and applied in photovoltaic devices. Here, lead‐free hybrid light absorbers used in PV devices are focused and their recent developments in related solar cell applications are reviewed comprehensively. In the first part, group 14 metals (Sn and Ge)‐based perovskites are introduced with more emphasis on the optimization of Sn‐based PSCs. Then concerns on halide hybrids of group 15 metals (Bi and Sb) are raised, which are mainly perovskite derivatives. At the same time, transition metal Cu‐based perovskites are also referred. In the end, an outlook is given on the design strategy of lead‐free halide hybrid absorbers for photovoltaic applications. It is believed that this timely review can represent our unique view of the field and shed some light on the direction of development of such promising materials.

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Section: Introductionmentioning

confidence: 99%

Lead‐Free Hybrid Perovskite Absorbers for Viable Application: Can We Eat the Cake and Have It too?

2017

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“…This outstanding performance can be traced to their long carrier lifetimes, long diffusion length, and low trap densities 9, 10, 11, 12. These excellent properties, along with their high quantum yield and wavelength tunability, make halide perovskites ideal for light‐emission applications such as for light‐emitting diodes (LEDs), light‐emitting field‐effect transistors, and lasing 13, 14, 15, 16, 17, 18, 19.…”

Section: Introductionmentioning

confidence: 99%

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

et al. 2016

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Organic–inorganic metal halide perovskites have recently demonstrated outstanding efficiencies in photovoltaics as well as highly promising performances for a wide range of optoelectronic applications such as lasing, light emission, optical detectors, and even for radiation detection. Key to the realization of functional perovskite micro/nanosystems on the ubiquitous silicon optoelectronics platform is through sophisticated lithography. Despite the rapid progress made in halide perovskite lasing, direct lithographic patterning of perovskite films to form optical cavities on conventional substrates remains extremely challenging. This study realizes room‐temperature high‐quality factor whispering‐gallery‐mode lasing (Q ≈ 1210) from patterned lead halide perovskite microplatelets fabricated in periodic arrays on silicon substrate with micropatterned BN film as the buffer layer. By varying the size of the platelets, modal selectivity for single mode lasing can be achieved with different cavity sizes or by simply breaking the structural symmetry of the cavity through designing the pattern. Importantly, this work demonstrates a straightforward, versatile bottom‐up scalable strategy to realize high‐quality periodic perovskite arrays with variable cavity sizes for large‐area light‐emitting and optical gain applications.

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“…In this study, mesoscopic PSCs are composed of a fluorine doped tin oxide (FTO)-coated glass substrate, a compact TiO 2 layer followed by a m-TiO 2 layer, a mixed (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 (FA = formamidinium, MA = methylammonium) perovskite layer that infiltrates into the m-TiO 2 , a spiro-OMeTAD layer, and a Au counter electrode. [19] We investigate the effect of the introduction of the rGO flakes in each layer comparing the results with control cells without rGO. Furthermore, to better examine the effect of rGO in the ETM, we compared devices with and without treating the TiO 2 surface with lithium bistrifluoromethanesulfonimidate (Li-TFSI), which was recently shown to improve the device performance by facilitating the interfacial electron injection.…”

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confidence: 99%

Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells

et al. 2016

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In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous TiO 2 (m-TiO 2 ) matrix, highly efficient solar cells with power conversion efficiency values up to 19.54 % were realized. In addition, the boosted beneficial role of rGO with and without Li-treated m-TiO 2 is highlighted, improving transport and injection of photoexcited electrons. This combined system may pave the way for further development and optimization of electron transport and collection in high efficiency PSCs.Since its isolation in 2004, [1] graphene has had a huge impact on applications in optoelectronic and photon energy conversion, owing to its unique electronic, optical, and mechanical properties. [2][3][4][5] The development of solution-processable graphene, such as the chemical exfoliation of graphite into graphene oxide, allowed the functionalization and processing of graphene, extending its use in the different layers of solutionprocessable solar cells. [6,7] Among different solar cell technologies, organic-inorganic hybrid perovskite solar cells (PSCs) have been dominating the interest of the scientific research community for their impressive technological development with power conversion efficiency (PCE) values beyond 22 % in a short of six years of research. [8] However, further improvements are necessary to optimize the PSC device operation and stability, and enhance the device performance. From this point, mixed graphene-based derivatives have been proposed to further enhance the device properties. [7] Used in various forms and with different functionalities, either incorporated in mesoscopic or in planar device configuration, [9,10] functionalized reduced graphene oxide (rGO) derivatives have been successfully employed for improved charge extraction in the electrontransport material (ETM) [9,11,12] or hole-transport material (HTM) [13] in PSCs. Its ability to effectively reduce the chargerecombination pathways and decrease the leakage currents has been demonstrated, with a similar role as in organic solar cells. [14][15][16] However, all of the PCEs reported are limited to less than 14 % and the perovskite was not formed as a perfect film, which casts the doubt on the real beneficial role of rGO on high-efficiency PSCs. In contrast to many applications of carbon-based materials that are usually introduced at the perovskite/TiO 2 or perovskite/HTM interfaces, or in substitution of the HTM itself, [17,18] here we propose a systematic study by exploring three different configurations as shown in Figure 1.We integrated the rGO: 1) in the 2,2',7,7'-tetrakis(N,N'-di-pmethoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) HTM, 2) in the matrix of the active perovskite layer, and 3) within the mesoporous TiO 2 (m-TiO 2 ) ETM. In this study, mesoscopic PSCs are composed of a fluorine doped tin oxide (FTO)-coated glass substrate, a compact TiO 2 layer followed by a m-TiO 2 layer, a mixed (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 (FA = formamidin...

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High-performance photovoltaic perovskite layers fabricated through intramolecular exchange

Cited by 5,603 publications

References 24 publications

Lead‐Free Hybrid Perovskite Absorbers for Viable Application: Can We Eat the Cake and Have It too?

Lead‐Free Hybrid Perovskite Absorbers for Viable Application: Can We Eat the Cake and Have It too?

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells

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