Gradient-Band Alignment Homojunction Perovskite Quantum Dot Solar Cells

Yuan, Jifeng; Bi, Chenghao; Xi, Jiahao; Guo, Ruiqi; Tian, Jianjun

doi:10.1021/acs.jpclett.0c03628

Cited by 37 publications

(44 citation statements)

References 49 publications

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“…[ 93 ] For example, Yuan et al achieved CsPbI 3 PQDs of three bandgap values (1.78, 1.79, and 1.80 eV) by controlling the size of the PQDs and then constructed gradient‐band homojunction solar cells, thus inducing the formation of additional driving force for the carries, which facilitates the charge extraction and increases the carrier diffusion length in the PQD film. [ 96 ] Consequently, the device yielded a high PCE of 13.2% with V OC as high as 1.25 V.…”

Section: Performance Enhancement Of Pqdscsmentioning

confidence: 99%

Perovskite Quantum Dots in Solar Cells

Liu

Najar

et al. 2022

Advanced Science

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Perovskite quantum dots (PQDs) have captured a host of researchers' attention due to their unique properties, which have been introduced to lots of optoelectronics areas, such as light-emitting diodes, lasers, photodetectors, and solar cells. Herein, the authors aim at reviewing the achievements of PQDs applied to solar cells in recent years. The engineering concerning surface ligands, additives, and hybrid composition for PQDSCs is outlined first, followed by analyzing the reasons of undesired performance of PQDSCs. Subsequently, a novel overview that PQDs are utilized to improve the photovoltaic performance of various kinds of solar cells, is provided. Finally, this review is summarized and some challenges and perspectives concerning PQDs are also discussed.

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Section: Performance Enhancement Of Pqdscsmentioning

confidence: 99%

Perovskite Quantum Dots in Solar Cells

Liu

Najar

et al. 2022

Advanced Science

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“…The injection and extraction of charge carriers depends greatly on the properties of the carrier transporting layer. [ 116–120 ] To achieve the high performance of dual‐functional PLESCs, we should minimize the energy offset at the ETL/HTL‐perovskite interface and ensure an effective bidirectional charge carrier transfer. [ 46 ] In this section, we highlight the basic guidelines and strategies for energy band alignment in dual‐functional PLESCs.…”

Section: Energy Band Alignment In Plescsmentioning

confidence: 99%

Recent Progress in Perovskite‐Based Reversible Photon–Electricity Conversion Devices

Liang

Xia

Mei

et al. 2021

Adv Funct Materials

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Solution‐processed metal halide perovskites have the advantages of a tunable bandgap, excellent charge transport properties, and suitable exciton binding energy. They therefore emerge as promising semiconductors for efficient perovskite solar cells (PSCs) and bright perovskite light‐emitting diodes (PLEDs). In addition, these devices possess a similar planar–heterojunction architecture, thus novel dual‐functional perovskite light‐emitting solar cells (PLESCs) that can realize electrical‐to‐optical and optical‐to‐electrical conversion on one device are developed. To date, high‐performance PLESCs with 17.2% electroluminescence external quantum efficiency and 25.2% power conversion efficiency are achieved using a holistic optimization approach. However, a comprehensive review focusing on dual‐functional PLESCs with discussion on their development and limitations, remains lacking. Herein, the rapid progress in PLESCs, including 0D quantum dot, 2D Ruddlesden–Popper, and 3D bulk perovskite devices, is reviewed. First, the fundamental understanding of the device structure and working principle of PLESCs is overviewed. Second, the state‐of‐the‐art developments for simultaneously achieving high‐efficiency PSCs and PLEDs, focusing on defect passivation, interface optimization, energy level alignment, and dimensional control, are comprehensively summarized. Finally, the authors offer some perspectives for future trends in the development of promising PLESCs, which can provide guidelines for this emerging field.

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“…This efficiency improvement rooting from the PHJ also confirmed in subsequent reports. [ 16–19 ] Sun et al . constructed graded bandgap perovskite with intrinsic n–p homojunction, which efficiently boosts carrier separation and finally the efficiency of p–i–n PSC was improved to 21.4%.…”

Section: Introductionmentioning

confidence: 99%

“…[ 16 ] In addition, perovskite dot homojunction with three layers of CsPbI 3 has also been fabricated by Yuan et al, which facilitated the carrier separation and extraction due to the additional driving force of the built‐in electric field within PHJ. [ 18 ] In the study of PHJ, researchers have reached a consensus that built‐in electric field plays a crucial role in device efficiency improvement. However, the poor stability of perovskite materials still exists in the PHJ, which is a serious threat to the maintenance of the built‐in electric field.…”

Section: Introductionmentioning

confidence: 99%

Stability Improvement of Perovskite Homojunction by Inhibiting the Diffusion of Doping Defects

Yan

Wang

et al. 2022

Solar RRL

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Perovskite homojunction can promote the separation and oriented transportation of the photocarriers through the built‐in electric field, and weaken the dependence of solar cells on the charge transport layer. Although the perovskite homojunction shows great advantages in improving device efficiency, it retains the inherent poor stability of perovskite materials. Herein, it is found that donor defects (MA+ interstitial, I− vacancy, etc.) in the n‐type layer are prone to compensate the acceptor defects (MA+ vacancy, I− interstitial, etc.) in the p‐type layer. This compensation behavior results from the diffusion of doping defects driven by a concentration gradient, which leads to the weakening of the built‐in electric field. Furthermore, phenethylammonium iodide is introduced into the perovskite homojunction to inhibit the defect diffusion, which enhances the stability of the homojunction and the corresponding solar cells. After modification, the efficiency of perovskite homojunction solar cells is improved from 8.60% to 9.60%, and retains 80% (standard ≈30%) of initial efficiency after 1000 h aging.

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Gradient-Band Alignment Homojunction Perovskite Quantum Dot Solar Cells

Cited by 37 publications

References 49 publications

Perovskite Quantum Dots in Solar Cells

Perovskite Quantum Dots in Solar Cells

Recent Progress in Perovskite‐Based Reversible Photon–Electricity Conversion Devices

Stability Improvement of Perovskite Homojunction by Inhibiting the Diffusion of Doping Defects

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