Solar RRL
·
2019
·Vol. 3
·期 4
·1800315
·
IF 0
Yang Zhou,Xiang Zhang,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Carbon-based perovskite solar cells (PSCs) have gathered much attention due to their excellent thermal stability and low cost. However, the typically used hole-conductor-free PSCs based on carbon electrodes show the worst performance due to the serious charge recombination at the perovskite/carbon interface. In this work, the efficient and stable carbon-based CsPbI 2 Br PSCs using Co 3 O 4 as the hole transport material (HTM) are fabricated and their photoelectric properties are systematically investigated. It is found that the Co 3 O 4 inorganic HTM effectively promotes photo-generated charges separation and extraction, and suppresses charge recombination at the CsPbI 2 Br/carbon electrode interface, resulting in the improved photovoltaic performance. At the optimal Co 3 O 4 concentration, the carbon-based CsPbI 2 Br PSCs achieve the maximum efficiency of 11.21% with a negligible J – V hysteresis. This work provides a novel strategy to fabricate efficient and stable all-inorganic PSCs.
研究领域:
光伏技术
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材料科学
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纳米技术
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可再生能源
✓ 已验证
DOI
Solar RRL
·
2020
·Vol. 4
·期 10
·2000268
·
IF 7.527
Hui Li,Longwei Yin
All inorganic mixed-halide CsPbI 2 Br perovskites with suitable bandgap and superior thermal durability have ignited rising interests in the field of perovskite solar cells (PSCs). However, the serious energy losses derived from deleterious trap-assisted defects–induced notorious nonradiative recombination and inferior moisture durability are still the primary hindrance on the way to develop high-performance CsPbI 2 Br PSCs. Herein, a novel passivation strategy is presented by introducing dual-functionalized bidentate molecule 2-(2′-thienyl)pyridine (2-ThPy) to modulate perovskite crystallization and passivate halogen vacancy defects. Compared with monodentate counterparts, 2-ThPy can anchor Pb 2+ sites via S and N atomic bonding simultaneously, and the synthesized CsPbI 2 Br films exhibit enlarged grain size, show advantages to passivate defect states, and dramatically reduce trap density, thereby lessening the detrimental carrier recombination. Consequently, a champion power conversion efficiency (PCE) of 12.69% with negligible hysteresis is delivered for the fabricated CsPbI 2 Br PSCs treated with 2-ThPy. Moreover, the moisture stability of CsPbI 2 Br PSCs with 2-ThPy is also greatly enhanced, and the device without encapsulation retains 92% of initial PCE value after 30 days aging under 25 °C and 40% relative humidity in ambient environment. The bidentate molecules passivation strategy paves a promising avenue to implement efficient and stable inorganic PSCs.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2018
·Vol. 9
·期 7
·1803572
·
IF 21.875
Chong Liu,Wenzhe Li,Huanyong Li,Huamin Wang,Cuiling Zhang,Yingguo Yang,Xingyu Gao,Qifan Xue,Hin-Lap Yip,Jiandong Fan,Ruud E. I. Schropp,Yaohua Mai
Although all-inorganic perovskite solar cells (PSCs) demonstrate high thermal stability, cesium-lead halide perovskites with high iodine content suffer from poor stability of the black phase (α-phase). In this study, it is demonstrated that incorporating InCl 3 into the host perovskite lattice helps to inhibit the formation of yellow phase (δ-phase) perovskite and thereby enhances the long-term ambient stability. The enhanced stability is achieved by a strategy for the structural reconstruction of CsPbI 2 Br perovskite by means of In 3+ and Cl − codoping, which gives rise to a significant improvement in the overall spatial symmetry with a closely packed atom arrangement due to the crystal structure transformation from orthorhombic (Pnma) to cubic (Pm-3m). In addition, a novel thermal radiation heating method that further improves the uniformity of the perovskite thin films is presented. This approach enables the construction of all-inorganic InCl 3 :CsPbI 2 Br PSCs with a champion power conversion efficiency of 13.74% for a small-area device (0.09 cm 2 ) and 11.4% for a large-area device (1.00 cm 2 ).
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 37
·2102272
·
IF 13.281
Xi Guo,Biao Zhao,Kunxiang Xu,Shaomin Yang,Zhike Liu,Yu Han,Jie Xu,Dongfang Xu,Zhanao Tan,Shengzhong (Frank) Liu
Interface modification to minimize charge recombination and trapping for efficient charge transport is crucial for the performance of perovskite solar cells (PSCs). Herein, functionalized p-type blue carbon dots (B-CDs) are ventured as an interface passivation layer to enhance the efficiency and long-term stability of all-inorganic CsPbI 2 Br PSCs. It is found that first the blue carbon dots with abundant N H, C N, C O, and CO functional groups effectively passivate defects by reacting with I − and Pb 2+ ions in the perovskite through hydrogen and coordinative bonds. Second, the p-type B-CDs modifiers form a P–N junction with the n-type perovskite to provide efficient pathways for hole transfer and electron blocking. Third, the B-CDs increase the hydrophobicity of the perovskite film to improve the stability of CsPbI 2 Br PSCs. With the above advantages, the CsPbI 2 Br PSC with B-CDs modification shows an efficiency as high as 16.76%, one of the highest for its type. In addition, the modification renders significant improvement of air and light stability, with 95.33% of the initial PCE retained after storage in the ambient environment for 1000 h. This work demonstrates the great potential of B-CDs application in perovskite-based optoelectronic devices.
研究领域:
材料科学
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光伏技术
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界面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
·
2022
·
IF 8.589
Qiulu Chen,Like Lin,Yanzhou Wang,Zhe Gao,Yujun Fu,Qiming Liu,Junshuai Li,Deyan He
CsPbI 2 Br-based perovskite solar cells (PSCs) have attracted much attention because of their excellent phase stability and appropriate bandgap. However, numerous defects of undercoordinated ions or mobile species are the sites of carrier nonradiative recombination, causing a low power conversion efficiency (PCE). In this work, NaCl and nitrogen-doped graphene quantum dots (N-GQDs) as binary additives are introduced into perovskite precursor to obtain high-quality photoactive films. Chloride ion (Cl − ) is incorporated into perovskite due to the same physical and chemical properties as bromine (Br − ), that align the energy level of CsPbI 2 Br, decrease the energy barrier between perovskite and P3HT to promote carrier transport and extraction, hence result in the reduced energy loss. Meanwhile, because of its good conductivity, N-GQDs at grain boundaries can rapidly conduct photogenerated electrons to SnO 2 , suppressing carrier recombination at grain boundaries. Furthermore, the trap state density of the CsPbI 2 Br film with binary additives is reduced, which could prolong the carrier lifetime, and improve surface morphology. As a result, a PCE of 15.37% for CsPbI 2 Br PSCs with binary additives is obtained，which shows ∼22.76% relative increment compare with the pristine PSCs. Therefore, a simple and convenient optimization strategy of binary additives for PSCs is proposed in this work.
研究领域:
材料科学
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光伏技术
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 5
·719-727
·
IF 6.098
Chen Shan-Ci,Zhang Senya,Zheng Qingdong
Recently, perovskite solar cells (PVSCs) based on CsPbI 2 Br have attracted increasing attention owing to their good balance between efficiency and stability. Solution-processed CsPbI 2 Br perovskites usually contain various defects which need passivation for PVSCs with high-performance as well as good stability. Since the degradation of perovskite films usually begins at the grain boundaries, here we report a facile defect passivation strategy by spin-coating a KF solution on the CsPbI 2 Br perovskite surface. The deposited KF salt mostly locates at the grain boundaries of the perovskite surface, resulting in PVSCs with improved stability. Both steady-state and time-resolved photoluminescence results suggest that the defects of perovskite were significantly passivated by KF treatment. Consequently, the best-performance PVSC based on CsPbI 2 Br with KF treatment shows an enhanced power conversion efficiency (PCE) of 15.01% with a larger open circuit voltage ( V OC ) of 1.26 V in comparison with the pristine CsPbI 2 Br-based counterpart which exhibits an inferior PCE of 14.14% with a V OC of 1.18 V.
研究领域:
光伏技术
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材料科学
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钙钛矿太阳能电池
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表面工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Ran Yin,Ke-Xiang Wang,Shuang Cui,Bing-Bing Fan,Jing-Wen Liu,Yu-Kun Gao,Ting-Ting You,Peng-Gang Yin
The interface closely related to carrier transport plays a vital role in high-performance perovskite solar cells (PSCs). In this work, an ionic liquid (IL) 1-butyl-3-methylimidazole hexafluorophosphate (BMIMPF6) has been introduced to simultaneously modify the TiO2 and perovskite films, which improves the energy level matching and contact of the TiO2/CsPbI2Br interface as well as provides perovskite films with larger grain size, leading to more faster charge transfer and lower energy loss. Furthermore, the BMIMPF6 modifier passivates the perovskite film defects and reduces defect-induced charge trapping and recombination in CsPbI2Br PSCs. Under dual-interface modification, the open-circuit voltage of the modified device increased to 1.22 V, and the power conversion efficiency (PCE) increased from 10.65 to 13.19%. Moreover, the unencapsulated modified devices exhibit an enhanced stability and maintain 91% of their initial PCE after 60 days of storage. This work has provided a strategy for efficient and stable PSCs by exploiting an IL to optimize the dual-interface at the same time.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jialiang Shi,Haozhen Deng,Fengli Liu,Ruoshui Li,Xiaosong Qiu,Yongsheng Tu,Liyu Wu,Yuan Xu,Jingxu Tian,Chenwei Zhu,Jihuai Wu,Zhang Lan
Compared with organic–inorganic hybrid perovskite solar cells (PSCs), carbon-based all-inorganic PSCs have the advantages of low preparation cost, simple process, and good thermal stability. Here, three polar materials of 4-tert-Butylpyridine halides (tBPX: X = Cl, Br, I) are modified between the perovskite absorbent layer and the carbon electrode. On the one hand, the introduction of tBPX effectively improves the dielectric constant of perovskite nanocrystals and reduces the carrier trapping ability of defects. On the other hand, the structural–functional groups act on the perovskite interface, effectively passivate the surface defects of the perovskite nanoscale thick film, and reduce the nonradiative recombination loss of carriers. In addition, the interface modification of tBPX forms a hydrophobic protective barrier, which significantly improves the moisture resistance of the device. As a result, the carbon-based CsPbI2Br PSCs achieve a power conversion efficiency (PCE) of 14.39%, which is higher than 12.79% of the pristine device. The optimized device can maintain more than 80% of the original efficiency after 800 h of aging under a 20 ± 5% relative humidity in the atmospheric environment. Therefore, it provides an idea for the preparation of efficient and stable carbon-based all-inorganic PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Jiexuan Jiang,Ronghua Li,Dongliang Liu,Hongtao Xie,Qiugui Zeng,Yanbo Li
The all-inorganic CsPbI2Br perovskite possesses outstanding thermal stability as a light absorber in perovskite solar cells (PSCs) or photodetectors. Still, their sensitivity to moisture induces irreversible decomposition and a large number of halogen vacancy defects, hindering their commercial applications. Herein, by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquids (ILs) as a precursor additive, a CsPbI2Br light absorber with an improved carrier lifetime and reduced trap density is achieved. Moreover, the modification of the perovskite surface with CsPbBr3 quantum dots (QDs) further improved the efficiency and moisture stability of the PSC. As a result, the BMIMBF4 IL and CsPbBr3 QD co-modified PSC achieves a maximum power conversion efficiency (PCE) of 15.37% and retained 80% of its initial PCE after exposure to ambient air for 60 h. This work proposes a synergistic approach for developing high-performance organic-free PSCs with an improved PCE and moisture stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haoyu Wang,Huajie Xu,Shuanghong Wu,Yang Wang,Yan Wang,Xiaohui Wang,Xiaodong Liu,Peng Huang
The CsPbI 2 Br material has gained recognition as an exceptional candidate for both single- and multi- junction solar cells due to its remarkable thermal and light stability, along with its suitable band gap. However, despite these inherent advantages, CsPbI 2 Br perovskite solar cells (PSCs) still encounter significant energy losses, which impede the further enhancement of their efficiency. Although various approaches involving additives and interface engineering techniques improved device performance, the influence of these methods on the perovskite lattice is frequently overlooked. Herein, synergistic lattice regulation through the combination of potassium acetate (KAc) as electron interface layer and methylammonium chloride (MACl) as perovskite additive, was proposed. The MACl dopant effectively increases the crystallinity and grain size of CsPbI 2 Br film by retarding the crystallization rate of perovskite, resulting in the enhancement in short-circuit current density ( J sc ) of PSCs. Unfortunately, unlike the behavior observed in inorganic–organic perovskites, the introduction of Cl‾ from MACl into the interstitial positions leads to lattice expansion in CsPbI 2 Br, resulting in reduced open-circuit voltage ( V oc ) and fill factor (FF). However, the incorporation of K + replacing Cs + effectively mitigates lattice distortion phenomena. Consequently, the CsPbI 2 Br PSCs, benefiting from the complementary effects of the MACl additive and KAc interfacial layer, exhibit an outstanding champion power conversion efficiency of 17.11 %. This research offers profound insights into the impact of ions introduced through additive and interface engineering on perovskite lattice stress.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2021
·
IF 6.475
Yaochang Yue,Jiyu Zhou,Qian Cheng,Xuning Zhang,Boxin Wang,Yanxun Li,Shilin Li,Ruiqi Cao,Kaiyuan Wang,Hui Wang,Huiqiong Zhou,Yuan Zhang
Bromine-containing metal halide all-inorganic perovskite CsPbI2Br exhibits excellent photoelectric performance and supreme thermal and structural stabilities; it is thus attractive for use as photoabsorbing layers in perovskite solar cells (PSCs). However, when steric hindrance molecules are introduced, the complicated phase transition mechanism and the difficult-to-control crystallization process in CsPbI2Br are not well understood. Here, we introduce a class of sterically hindered cesium naphthenate small molecules to control the crystallization process of CsPbI2Br films. Of interest, a new intermediate monoclinic phase has been discovered which leads to formation of dense and nonporous polycrystalline perovskite films. This phenomenon was also explained by density functional theory. The residues of steric hindrance molecules inside the CsPbI2Br film also improve its stability. We further show that as the ring number of cycloalkanes increases, the hindrance for the crystallization becomes more significant. Thus, by choosing the suitable steric hindrance, the optimal photovoltaic efficiency is 15.45%.
研究领域:
材料科学
·
化学
·
物理学
·
纳米技术
·
能源技术
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2020
·Vol. 10
·期 46
·2002882
·
IF 25.245
Shaomin Yang,Weiduan Liu,Yu Han,Zhike Liu,Wenjing Zhao,Chenyang Duan,Yuhang Che,Haoshuang Gu,Yuebin Li,Shengzhong (Frank) Liu
Inorganic CsPbI 2 Br perovskite solar cells (PSCs) have gained enormous research interest due to their excellent thermal and light stabilities. However, their unsatisfactory power-conversion efficiency and poor intrinsic phase stability remain roadblocks to their further development. Herein, Cs 2 PbI 2 Cl 2 nanosheets (NSs) with the Ruddlesden–Popper (RP) structure are synthesized, and an NSs/CsPbI 2 Br/NSs heterostructure is employed to enhance both the stability and efficiency of CsPbI 2 Br solar cells. The novel Cs 2 PbI 2 Cl 2 NSs can not only passivate the top and bottom surfaces of the perovskite film and top surface of the TiO 2 film but also enhance the stability of the perovskite film. Based on the heterostructured NSs/CsPbI 2 Br/NSs inorganic perovskite film, the efficiency of the CsPbI 2 Br PSCs is improved from 15.02% to 16.65%. Moreover, the unencapsulated CsPbI 2 Br devices with the NSs/CsPbI 2 Br/NSs heterostructure sustain over 90% of their original efficiencies after being exposed to ambient conditions (≈25 °C and ≈35% RH) for 648 h. Both the UV-light-soaking stability (100 mW cm −1 365 nm UV light) and thermal stability ( T = 85 °C) of the optimized devices are dramatically improved in comparison with their counterparts with only a 3D active layer. Therefore, this work promotes the application of RP inorganic perovskite nanocrystals in a range of perovskite optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）