Hybrid Quantum Dot/Organic Heterojunction: A Route to Improve Open-Circuit Voltage in PbS Colloidal Quantum Dot Solar Cells

Zhang, Yannan; Kan, Yuanyuan; Gao, Ke; Gu, Mingxia; Shi, Yao; Zhang, Xuliang; Xue, Ye; Zhang, Xuning; Liu, Zeke; Zhang, Yuan; Yuan, Jianyu; Ma, Wanli; Jen, Alex K.‐Y.

doi:10.1021/acsenergylett.0c01136

Cited by 62 publications

(76 citation statements)

References 45 publications

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“…After the year 2018, adopting narrow E g NFAs has become an efficient strategy to further improve the efficiency of HSCs. [ 18,19,32,36 ] Here, we first report the use of representative NFA Y6 as the electron acceptor blending with CsPbI 3 QD, and achieve the highest efficiency of 15.05%, indicating the large potential to boost the efficiency of HSCs with such a hybrid strategy. Clearly, the enhancement of PCE mainly results from the improved J sc and V oc .…”

Section: Resultsmentioning

confidence: 94%

“…One is a donor/acceptor type hybrid bulk‐heterojunction (BHJ) blend system; [ 12–16 ] however, these devices suffer from insufficient carrier extraction and poor charge transfer, leading to low power conversion efficiencies (PCEs) around 6%. [ 16 ] The other is QDs as light‐absorbing host and organic semiconductors as interfacial layer, [ 17–19 ] and a record PCE of 13.1% for HSCs was reported by Sargent and co‐workers using such a strategy by spin‐coating a polymer/molecule layer on top of the PbS QD film. [ 19 ]…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Yuan¹,

Zhang²,

Sun³

et al. 2021

Adv Funct Materials

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Organic‐inorganic hybrid film using conjugated materials and quantum dots (QDs) are of great interest for solution‐processed optoelectronic devices, including photovoltaics (PVs). However, it is still challenging to fabricate conductive hybrid films to maximize their PV performance. Herein, for the first time, superior PV performance of hybrid solar cells consisting of CsPbI3 perovskite QDs and Y6 series non‐fullerene molecules is demonstrated and further highlights their importance on hybrid device design. In specific, a hybrid active layer is developed using CsPbI3 QDs and non‐fullerene molecules, enabling a type‐II energy alignment for efficient charge transfer and extraction. Additionally, the non‐fullerene molecules can well passivate the QDs, reducing surface defects and energetic disorder. The champion CsPbI3 QD/Y6‐F hybrid device has a record‐high efficiency of 15.05% for QD/organic hybrid PV devices, paving a new way to construct solution‐processable hybrid film for efficient optoelectronic devices.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Yuan¹,

Zhang²,

Sun³

et al. 2021

Adv Funct Materials

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“…The PCE and voltage loss evolution of CQDSCs with organic HTLs over the years. The organic materials include P3HT, [204] PTB7, [77] PBDTTT-E-T:IEICO, [6] PBDB-TF, [205] PTB7-Th:PC 71 BM, [206] PBDTTPD-HT, [79] TIPS-TPD, [80] asy-ranPBTBDT, [78] and PD2FCT-29DPP. [21] organic HTLs show significantly higher stability.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Open‐Circuit Voltage Loss in Lead Chalcogenide Quantum Dot Solar Cells

Liu

Xian

et al. 2021

Advanced Materials

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absorption coefficients, which can be used to capture the far-infrared of solar radiation. [13,14] This outperforms silicon-based and other solution-based semiconductor materials. Additionally, lead chalcogenide CQDSCs have the potential to break through the Shockley-Quesser limit, via multiple exciton generation. [15][16][17][18] In the past decade, lead chalcogenide CQDSCs have attracted abundant attention and their power conversion efficiencies (PCEs) have increased from ≈3% to ≈14%. [19][20][21] Moreover, the facile solution-processability (synthesis and ligand exchange) allows the production of solar cells by spraying, scraping, and roll-to-roll process, enabling great commercial potential. [22][23][24][25] Recently, some reports discussed the commercial viability of lead chalcogenide CQDSCs. [26,27] The results demonstrated that the cost of flexible lead chalcogenide CQDSCs can be as low as ≈0.94 $ per W, indicating the strong competitiveness of these solution-processability solar cells. To reach this low production cost, the PCEs of the CQDSCs are assumed to be 19% and the devices are assumed to be manufactured via a roll-toroll process. [27] Thus, it is still a great challenge for the commercialization of lead chalcogenide CQDSCs, and the low PCE is still the main obstacle for its market competitiveness.We summarize the main developments of lead chalcogenide CQDSCs (see Figure 1). In the early stage, the Schottky structure was used and it achieved the highest PCE of ≈5.2% in 2013. [28] But after 2014, there exist few reports of lead chalcogenide CQDSCs with the Schottky structure, due to the mismatch between optical absorption and charge extraction. [29] Subsequently, the n-p structure and depleted bulk heterojunction (DBH) structure have greatly improved the PCEs of lead chalcogenide CQDSCs. [30,31] N-p structure uses p-n junction to improve carrier extraction efficiency and reduce recombination, thus increasing the PCE of lead chalcogenide CQDSCs from ≈3% to above 9% in 2015. [19,32] Additionally, the absorption coefficient of lead chalcogenide CQDSCs reaches ≈10 6 cm −3 , which means that it is essential to use ≈1 μm solar absorber to fully absorb solar radiation. The DBH structure uses a bulk electron transport layer (ETL) to address the challenge of insufficient carrier diffusion length for the n-p structure, thus increasing the absorber thickness and greatly improving the short-circuit current (J sc ). [33][34][35] Through continued efforts, the PCE of the DBH structure has reached ≈10.8%. [36] To date, more research Lead chalcogenide colloidal quantum dot solar cells (CQDSCs) have received considerable attention due to their broad and tunable absorption and high stability. Presently, lead chalcogenide CQDSC has achieved a power conversion efficiency of ≈14%. However, the state-of-the-art lead chalcogenide CQDSC still has an open-circuit voltage (V oc ) loss of ≈0.45 V, which is significantly higher than those of c-Si and perovskite solar cells. Such high V oc loss severely limits the performance im...

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“…Specifically, PbS QD solar cells have achieved a PCE approaching 14% due to the improvements in surface passivation and device structure. [ 104–106 ] More recently, all‐inorganic CsPbI 3 QDs have emerged as a rising star in photovoltaic applications because of the advantages including low‐temperature processing under ambient conditions, the ability to stabilize otherwise unstable crystal phases, and high photoluminescence quantum yields resulting from impressive defect tolerance. [ 107–115 ] CsPbI 3 QD solar cells enabled the highest reported efficiency of over 16% for all kinds of QDs‐based devices.…”

Section: The Progress Of Anti‐solvent Treatmentmentioning

confidence: 99%

Advances in Metal Halide Perovskite Film Preparation: The Role of Anti‐Solvent Treatment

Sun

Yuan

et al. 2021

Small Methods

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In the past decade, hybrid organic‐inorganic perovskite solar cells (PSCs) have attracted significant attention. Since then, the power conversion efficiency has astonishingly reached to 25.5%, situating perovskites at the forefront of all reported solution‐processed photovoltaic materials. The research of PSCs has reached a stage where efficiency, stability, and cost need to be simultaneously considered before reaching the threshold for large‐scale commercialization. In this article, the recent progress in fabricating high‐quality perovskite thin‐films adopting “anti‐solvent” strategy is reviewed and the established nucleation and crystal growth mechanisms during the treatment process is discussed. In addition, present challenges and further opportunities of the anti‐solvent methodology toward efficient and large‐scale PSCs are highlighted. The continuous efforts dedicated to the development of anti‐solvent treatment for fabricating high‐performance large‐area devices may pave the way toward commercial applications of PSCs in the near future.

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Hybrid Quantum Dot/Organic Heterojunction: A Route to Improve Open-Circuit Voltage in PbS Colloidal Quantum Dot Solar Cells

Cited by 62 publications

References 45 publications

Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Hybrid Perovskite Quantum Dot/Non‐Fullerene Molecule Solar Cells with Efficiency Over 15%

Open‐Circuit Voltage Loss in Lead Chalcogenide Quantum Dot Solar Cells

Advances in Metal Halide Perovskite Film Preparation: The Role of Anti‐Solvent Treatment

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