p-Type molecular doping by charge transfer in halide perovskite

Euvrard, Julie; Gunawan, Oki; Zhong, Xinjue; Harvey, Steven P.; Kahn, Antoine; Mitzi, David B.

doi:10.1039/d1ma00160d

Cited by 27 publications

(24 citation statements)

References 59 publications

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“…Furthermore, doping MAPb 0.5 Sn 0.5 I 3 with F4TCNQ offers σ tunability of 5 orders of magnitude. Although the absolute σ is not very high due to the presence of 50% Pb, such doping shows the potential of tuning the electronic transport properties of perovskites …”

Section: Halide Perovskite Thermoelectricssupporting

confidence: 89%

Role of Dopants in Organic and Halide Perovskite Energy Conversion Devices

et al. 2021

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Doping serves as a vital strategy for tuning electronic and optoelectronic properties of semiconductors. Compared to organic semiconductors, the understanding and optimization of the doping process in halide perovskite semiconductors is still in its infancy. Nonetheless, there is a continuous surge in doping these semiconductors for performance enhancement. This perspective discusses the central role of dopants in organic and halide perovskite-based semiconductors used for energy conversion devices, particularly solar cells and thermoelectrics. We summarize various p-and n-type dopants explored for modifying the active layer in organic and perovskite devices, highlighting their challenges and limitations. Understanding doping-induced changes in electronic properties and their ramifications on device performance is essential for improving the device performance.

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Section: Halide Perovskite Thermoelectricssupporting

confidence: 89%

Role of Dopants in Organic and Halide Perovskite Energy Conversion Devices

et al. 2021

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“…[ 53,54 ] All PbI 2 phase forms around the perovskite grain boundary on the surface, similar to the previously reported works on organic–inorganic hybrid perovskite solar cells. [ 42,46,47,55,56 ] The X‐ray diffraction (XRD) patterns are shown in Figure 2b. Both the films present two typical peaks of α‐phase CsPbI 2.5 Br 0.5 phase located at 14.2° and 28.8° for the (100) and (200) crystal planes, respectively.…”

Section: Discussionmentioning

confidence: 99%

Composition Engineering of All‐Inorganic Perovskite Film for Efficient and Operationally Stable Solar Cells

Tian

Wang

Xue

et al. 2020

Adv Funct Materials

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Cesium-based inorganic perovskites have recently attracted great research focus due to their excellent optoelectronic properties and thermal stability. However, the operational instability of all-inorganic perovskites is still a main hindrance for the commercialization. Herein, a facile approach is reported to simultaneously enhance both the efficiency and long-term stability for allinorganic CsPbI 2.5 Br 0.5 perovskite solar cells via inducing excess lead iodide (PbI 2 ) into the precursors. Comprehensive film and device characterizations are conducted to study the influences of excess PbI 2 on the crystal quality, passivation effect, charge dynamics, and photovoltaic performance. It is found that excess PbI 2 improves the crystallization process, producing high-quality CsPbI 2.5 Br 0.5 films with enlarged grain sizes, enhanced crystal orientation, and unchanged phase composition. The residual PbI 2 at the grain boundaries also provides a passivation effect, which improves the optoelectronic properties and charge collection property in optimized devices, leading to a power conversion efficiency up to 17.1% with a high open-circuit voltage of 1.25 V. More importantly, a remarkable long-term operational stability is also achieved for the optimized CsPbI 2.5 Br 0.5 solar cells, with less than 24% degradation drop at the maximum power point under continuous illumination for 420 h.

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“…[48][49][50] Another approach, often termed surface transfer doping, allows for even larger DF of MHP surfaces. It comprises the use of strong molecular acceptors or donors deposited on the surface, so that ground state charge transfer occurs, which also induces an interface dipole and thus modifies F. [51][52][53] A different important process changes the majority charge carrier type and density, as well as F of a MHP, but leaves IE and EA unaffected: doping. Aside from intentionally introduced dopants in the bulk of MHPs, oxygen can diffuse into and out of MHP thin films, at least those containing organic cations.…”

Section: Environmental Effects On the Energy Levelsmentioning

confidence: 99%