Band-Aligned Polymeric Hole Transport Materials for Extremely Low Energy Loss α-CsPbI3 Perovskite Nanocrystal Solar Cells

Yuan, Jianyu; Ling, Xufeng; Yang, Di; Li, Fangchao; Zhou, Shaoxia; Shi, Junwei; Qian, Yuli; Hu, Jiaxin; Sun, Yuansheng; Yang, Yingguo; Gao, Xingyu; Duhm, Steffen; Zhang, Qiao; Ma, Wanli

doi:10.1016/j.joule.2018.08.011

Cited by 300 publications

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“…[42,48] Before CsPbI 3 QD film deposition, the TiO 2 film was exposed to UV-ozone for 10 min. [42,48] Before CsPbI 3 QD film deposition, the TiO 2 film was exposed to UV-ozone for 10 min.…”

Section: Cspbi 3 Qd Solar Cells Fabrication and Characterizationmentioning

confidence: 99%

“…[39][40][41][42][43][44][45] The change from bulk to nanoscale endows materials new advantages in engineering discrete energy levels, solution processing, and composition management. Quite recently, all-inorganic perovskite nanocrystals or QDs with CsPbX 3 stoichiometry quickly emerged and attracted wide attention in optoelectronic devices due to their flexible composition adjustment, size tunability, high tolerance to defects, and greatly improved phase stability.…”

mentioning

confidence: 99%

“…Quite recently, all-inorganic perovskite nanocrystals or QDs with CsPbX 3 stoichiometry quickly emerged and attracted wide attention in optoelectronic devices due to their flexible composition adjustment, size tunability, high tolerance to defects, and greatly improved phase stability. [41] In comparison with the thin-film CsPbI 3 solar cells, [36][37][38] the short-circuit current density (J SC ) of CsPbI 3 QD solar cells is still lagging, [40][41][42] which may be attributed to the insufficient charge transport caused by residual of the insulating surface ligands. Swarnkar et al first described the formation of α-CsPbI 3 QD films that are phase-stable for months under ambient condition and fabricated perovskite QD solar cells with an open-circuit voltage (V OC ) of 1.23 V and efficiency of 10.77%.…”

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confidence: 99%

“…2019, 9,1900721 solution in ethyl acetate (EtOAc) for 10 s. For the QD film posttreatment, a variety of Cs salts (CsAc, Cs 2 CO 3 , CsI, and CsNO 3 ) were investigated ( Figure S1, Supporting Information), as well as pure EtOAc ( Figure S2, Supporting Information). [17,41,42] The device reproducibility was studied and compared across 32 individual cells in several batches ( Figure 1c). Among the three Cs salt post-treatments studied here, the CsAc-treated device exhibited the best performance.…”

mentioning

confidence: 99%

“…2019, 9,1900721 stability issues. [40,42] Further improving the stability of QD solar cells against humid air requires sensible design of device structure and effective QD film stabilization. The device stability of CsPbI 3 QD solar cells in N 2 and air atmosphere was studied and the results are shown in Figure S12 (Supporting Information).…”

mentioning

confidence: 99%

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14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ling

Zhou

Yuan

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Advanced Energy Materials

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During the past decade, inorganic CQDs, namely the lead chalcogenides (e.g., PbS), have attracted tremendous attention in solution-processed solar cells. Due to the great efforts on CQDs synthesis modification, [7][8][9] surface passivation, [10][11][12] and device fabrication optimization, [13][14][15][16] PbS QD solar cells continue to progress at an extraordinary rate, improving overall efficiencies by ≈1% per year and currently have a certified power conversion efficiency (PCE) exceeding 12%. [17] Meanwhile, the past decade has witnessed unprecedented success of organicinorganic hybrid perovskites in PV applications, with the reported PCE of perovskite solar cells exceeding 23%. [18][19][20][21][22][23][24][25][26][27][28] However, the challenging stability issues of these hybrid perovskites further motivate the research of all-inorganic perovskites (CsPbX 3 , X = Cl − , Br − , I − or mixed halides) without any volatile organic components. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications. However, the nonphotoactive orthorhombic phase (E g = 2.82 eV) is more thermodynamically preferred at low temperature. [29] Therefore, the perovskite phase of CsPbI 3 usually requires complex annealing processes at high temperature to achieve satisfactory film quality. As mentioned above, QD technology offers colloidal synthesis of conventional bulk materials, which Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI 3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs 2 CO 3 ), and cesium nitrate (CsNO 3 )) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI 3 perovskite surface but also improve electron coupling between CsPbI 3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI 3 QD solar cells. In addition, the Cs-salt-treated CsPbI 3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties. Perovskite Quantum DotsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Solution-processed colloidal quantum dots (CQDs) are promising candidates for the next generation photovoltaics (PVs) due to the excellent tuna...

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“…[42,48] Before CsPbI 3 QD film deposition, the TiO 2 film was exposed to UV-ozone for 10 min. [42,48] Before CsPbI 3 QD film deposition, the TiO 2 film was exposed to UV-ozone for 10 min.…”

Section: Cspbi 3 Qd Solar Cells Fabrication and Characterizationmentioning

confidence: 99%