JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 8
·4601-4609
·
IF 1.774
Zhang Xinxin,Zhang Jiejing,Su Pengyu,Feng Shuang,Xu Ri,Bian Chang,Fu Wuyou,Yang Haibin,Li Zhihui
Interfacial modification plays a vital role in boosting the performance of planar perovskite solar cells (PSCs). Here, perovskite-type BaTiO 3 nanocrystals prepared by immersing dense blocking TiO 2 (bl-TiO 2 ) in Ba(NO 3 ) 2 solution were used as an interfacial modifier. The interface bonding was improved due to the fact that BaTiO 3 and CH 3 NH 3 PbI 3 (MAPbI 3 ) have the same structure. Incorporation of BaTiO 3 nanocrystals effectively boosted the electron extraction rate and suppressed the carrier recombination at the interface. The MAPbI 3 grains nucleated and grew rapidly, resulting in larger grain size after introduction of BaTiO 3 nanocrystals. Photoluminescence (PL) spectroscopy, time-resolved PL decay spectroscopy, and electrochemical impedance spectroscopy measurements verified that the BaTiO 3 nanocrystals indeed promoted the carrier separation rate while suppressing nonradiative carrier recombination. By optimizing the bl-TiO 2 /MAPbI 3 interface, the power conversion efficiency of planar PSCs based on bl-TiO 2 /BaTiO 3 was improved from 15.03% to 17.71% [ J sc = 22.49 mA/cm 2 , V oc = 1.12 V, fill factor (FF) = 70%].
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 12
·5427-5434
·
IF 7.394
Weidong Zhu,Tao Yu,Faming Li,Chunxiong Bao,Hao Gao,Yong Yi,Jie Yang,Gao Fu,Xiaoxin Zhou,Zhigang Zou
A high-quality CH3NH3PbI3 film is crucial in the manufacture of a high-performance perovskite solar cell. Here, a recrystallization process via facile fumigation with DMF vapor has been successfully introduced to self-repair of CH3NH3PbI3 films with poor coverage and low crystallinity prepared by the commonly used one-step spin-coating method. We found that the CH3NH3PbI3 films with dendritic structures can spontaneously transform to the uniform ones with full coverage and high crystallinity by adjusting the cycles of the recrystallization process. The mesostructured perovskite solar cells based on these repaired CH3NH3PbI3 films showed reproducible optimal power conversion efficiency (PCE) of 11.15% and average PCE of 10.25 ± 0.90%, which are much better than that of devices based on the non-repaired CH3NH3PbI3 films. In addition, the hysteresis phenomenon in the current–voltage test can also be effectively alleviated due to the quality of the films being improved in the optimized devices. Our work proved that the fumigation of solvent vapor can modify metal organic perovskite films such as CH3NH3PbI3. It offers a novel and attractive way to fabricate high-performance perovskite solar cells.
研究领域:
材料科学
·
太阳能技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Wenhu Zhang,Pin Lv,Yujiao Li,Yangqing Wu,Jia Dong,Wenzhi Wang,Hairui Sun,Bingqiang Cao
Hole transport layer free perovskite solar cells (HTL-Free PSCs) have attracted extensive attention due to their advantages of simple structure and low cost. However, due to the serious energy level mismatch caused by the direct contact between the perovskite layer and the opposite electrode, the space for improving the efficiency of HTL-Free PSCs is greatly limited. We use Eu 3+ doped CsPbBr 3 quantum dots (QD) to modify the interface between MAPbI 3 :Na layer and C electrode, and study its effect on the surface defect passivation, interface energy level arrangement and carrier transport behavior in the device. It was found that compared with the interfacial modification of CsPbBr 3 QD alone, the interfacial modification of CsPbBr 3 :Eu QD could effectively solve the problem of energy level mismatch in HTL-Free PSCs, resulting in a remarkable improvement of conversion efficiency from 9.01 % to 12.95 %. Furthermore, electron beam induced current (EBIC) was used to prove that CsPbBr 3 :Eu QD interface modification significantly improved the hole collection ability. This provides an experimental basis and theoretical guidance for the optimization of the efficiency of other types of transport layer free photovoltaic devices.
研究领域:
材料科学
·
太阳能
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Zongbao Zhang,Yang Zhou,Yangyang Cai,Hui Liu,Qiqi Qin,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Planar perovskite solar cells (PSCs) based on CH 3 NH 3 PbI 3- x (SCN) x (SCN: thiocyanate) active layer and low-temperature processed TiO 2 films are fabricated by a sequential two-step method in ambient air. Here, alkali thiocyanates (NaSCN, KSCN) are added into Pb(SCN) 2 precursor to improve the microstructure of CH 3 NH 3 PbI 3- x (SCN) x perovskite layers and performance of the as-prepared PSCs. At the optimum concentrations of alkali thiocyanates as additives, the as-prepared NaSCN-modified and KSCN-modified PSCs demonstrate the efficiencies of 16.59% and 15.63% respectively, being much higher than 12.73% of the reference PSCs without additives. This improvement is primarily ascribed to the enhanced electron transport , reduced recombination rates and much improved microstructures with large grain size and low defect density at grain boundaries. Importantly, it is revealed that the modified PSCs at the optimized concentrations of alkali thiocyanates additives exhibit remarkably improved stability than the reference PSCs against humid circumstance, and a continuous exposure to humid air without encapsulation over 45 days only records about 5% degradation of the efficiency. These findings provide a facile approach to fabricate efficient and stable PSCs by low processing temperature in ambient air, both of which are highly preferred for future practical applications of PSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
·
光电化学
·
半导体器件
·
薄膜物理
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Xin Qi,Ganghong Liu,Duo Wang,Ning Zhu,Yuqing Zhang,Zehao Zhang,Cuncun Wu,Xiangdong Li,Wei Luo,Yingqiang Li,Haozhe Hu,Zhijian Chen,Lixin Xiao,Shufeng Wang,Bo Qu
Interfacial modification as a feasible strategy to improve the properties of perovskite solar cells (PSCs) has been widely studied in recent years. In this work, PbCl 2 modification at the interface of SnO 2 /CH 3 NH 3 PbI 3 was used for CH 3 NH 3 PbI 3 -based planar PSCs. The introduction of PbCl 2 between SnO 2 and CH 3 NH 3 PbI 3 layers boosted the crystallization of perovskite film, which promoted the photovoltaic properties of corresponding PSCs. The open circuit voltage ( V OC ) and fill factor (FF) of the PbCl 2 -modified devices (1 mg/mL) were 1.11 V and 0.79, respectively, which were both higher than those of the reference devices without PbCl 2 (1.04 V and 0.76). Moreover, a steady-state power output efficiency exceeding 19% was obtained for the PbCl 2 -modified devices (1 mg/mL), which implied that PbCl 2 modification was an effective and low cost strategy for efficient PSCs.
研究领域:
材料科学
·
光伏技术
·
纳米科技
·
表面与界面工程
·
能源材料
·
半导体器件
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuzhu Li,Zongbao Zhang,Yang Zhou,Lai Xie,Naitao Gao,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shui,Sujuan Wu,Junming Liu
Metal halide perovskite solar cells have drawn a lot of attention due to their excellent photovoltaic properties. However, a simple method to prepare perovskite films with high quality in ambient air remains a big challenge, which has become an obstacle for the commercialization of PSCs. Here we propose a facile method to prepare efficient CH 3 NH 3 PbI 3-x (SCN) x -based planar PSCs in ambient conditions and ammonium salts (NH 4 Cl, NH 4 SCN) are used to regulate the microstructure of CH 3 NH 3 PbI 3-x (SCN) x perovskite film prepared in ambient air. At the optimal concentration, the devices with NH 4 Cl or NH 4 SCN additives achieve the champion efficiency of 14.71% and 16.61% respectively, which are much higher than the 12.97% of the reference device. The stability of the unsealed devices with additives in ambient air has also been significantly improved. The modified devices without any encapsulation still retain about 80% of initial efficiency after 30 days in ambient air. The conductive atomic force microscopy and photoluminescence measurement are used to characterize photoelectric properties of perovskite film. The trap-state density and charge recombination of the devices have been investigated. The results suggest that the improved photovoltaic characteristics and stability may be attributed to the improved quality of perovskite films, the reduced trap states and the suppressed charge recombination.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiru Huang,Shenyue Li,Wenguang Hu,Shaofeng Shao,Qingfang Li,Lei Zhang
Machine learning and data-driven methods have attracted a significant amount of attention for the acceleration of the design of molecules and materials. In this study, a material design protocol based on multimode modeling that combines literature modeling, numerical data collection, textual descriptor design, genetic modeling, experimental validation, first-principles calculation, and theoretical efficiency calculation is proposed, with a case study on designing compatible complex solvent molecules for a halide perovskite film, which is notorious for optoelectronic deactivation under hostile conditions, especially in water. In the multimode modeling design process, the textual descriptors play the central role and store rich literature scientific knowledge, which starts from the construction of a high-dimension literature model based on scientific articles and is realized by a genetic algorithm for materials predictions. The prediction is substantiated by follow-up experiments and first-principles calculations, leading to the successful identification of effective molecular combinations delivering an unprecedented large aqueous photocurrent (increasing by 3 orders of magnitude compared with that of CH3NH3PbI3) and remarkable aqueous stability (improving from 36% to 89% after immersion in water) under the hostile condition. This study provides a practical route via multimode modeling for accelerating the design of molecule-modified and solution-processed materials in a real scenario.
研究领域:
材料科学
·
机器学习
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2019
·
IF 1.888
Hui Gao,Xue Meng,Yongli Du,Xiaoyong Gao
Perovskite MAPbI 3 (MA = methylammonium, CH 3 NH 3 ) films and solar cells have thoroughly been studied in recently years. However, the formation mechanism of MAPbI 3 in the two-step sol-gel process is not reported and not well understood yet. Thus in this work, the cubic perovskite MAPbI 3 films with preferred 〈110〉 orientation were fabricated on the glass substrates via the two-step sol-gel process. Impact of soaking time (t soaking ) of PbI 2 in MAI in isopropyl alcohol (IPA) solution was thoroughly studied on the microstructure and the optical properties of the MAPbI 3 films. The formation mechanism of MAPbI 3 in the two-step sol-gel process was in particular proposed. The blue and red shifts of the absorption edge of the films with increase of t soaking are attributed to the improved crystallization and to the weakened surface effect of the grains, respectively. An intermediate metal-organic frameworks (MOF) structure of PbI 2 :MAI:IPA is formed during the soaking due to Pb weakly coordinating with IPA organic molecules. The unstable MOF structure is collapsed during the following annealing, and PbI 2 and ions I − from the hydrolyzed MAI form the stable PbI 6 4− cubic frame. Ions (MA) + diffuse to the interstice positions in the cubic frame structure under the electrostatic force, thus producing the ultimate MAPbI 3 .
研究领域:
材料科学
·
光伏技术
·
薄膜制备
·
溶胶-凝胶工艺
·
钙钛矿太阳能电池
✓ 已验证
DOI
高影响因子
Solar RRL
·
2019
·Vol. 3
·期 7
·1900020
·
IF 0
Xueyan Shan,Shimao Wang,Weiwei Dong,Ning Pan,Jingzhen Shao,Xiangqi Wang,Ruhua Tao,Zanhong Deng,Linhua Hu,Fantai Kong,Gang Meng,Xiaodong Fang
For perovskite solar cells (PSCs), the surface traps of perovskite films have great influence on the charge carrier behavior at the interface of perovskite and charge transport layers. In this investigation, a 248 nm KrF excimer laser with high photon energy and shallow penetration depth is introduced to perform surface modification on the CH 3 NH 3 PbI 3 film through irradiation for reducing its surface trap density for the first time. A whole excimer laser surface modification (ELSM) process can be completed in few seconds, and the actual interaction time of the excimer laser and perovskite film is only several hundred nanoseconds. After ELSM, the trap density of the CH 3 NH 3 PbI 3 film decreases from 1.61 × 10 16 cm −3 to 5.81 × 10 15 cm −3 , and the nonradiative recombination is suppressed effectively. As a result, the open-circuit voltage and the power conversion efficiency (PCE) of CH 3 NH 3 PbI 3 -based PSCs increase from 1082 ± 27 to 1117 ± 16 mV and from 16.69% ± 0.77% to 18.50% ± 0.65%, respectively, and the PCE of the champion device reaches 19.38%. In addition, the measured larger charge recombination resistance, slower open-circuit photovoltage decay, and longer charge recombination lifetime confirm the effective suppression effect of ELSM on the charge carrier recombination in PSCs.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 23
·1901026
·
IF 15.621
Weiran Zhou,Dan Li,Zhengguo Xiao,Zhilin Wen,Mengmeng Zhang,Wanpei Hu,Xiaojun Wu,Mingtai Wang,Wen-Hua Zhang,Yalin Lu,Shihe Yang,Shangfeng Yang
The organic–inorganic halide CH 3 NH 3 PbI 3 (MAPbI 3 ) has been the most commonly used light absorber layer of perovskite solar cells (PSCs); however, solution-processed MAPbI 3 films usually suffer from random crystal orientation and high trap density, resulting in inferior power conversion efficiency (PCE) with open circuit voltage ( V oc ) being typically below 1.2 V for PSC devices. Herein, for the first time an imidazole sulfonate zwitterion, 4-(1H-imidazol-3-ium-3-yl)butane-1-sulfonate (IMS), is applied as a bifunctional additive in regular-structure planar heterojunction PSC devices to regulate the crystal orientation, yielding highly ordered MAPbI 3 film and passivating the trap states of the film. Such a dual effect of IMS is fulfilled via coordination interactions between the sulfonate moiety of IMS with the Pb2 + ion and the electrostatic interaction between the imidazole of IMS with the I – ion of MAPbI 3 . As a result, under a optimized IMS doping ratio of 0.5 wt%, the PSC device exhibits a significant increase in PCE from 18.77% to 20.84%, with suppressed current–voltage hysteresis and promoted ambient stability. Moreover, a high V oc of 1.208 V is achieved under a higher IMS doping ratio of 1.2 wt%, which is the highest V oc for regular-structure MAPbI 3 planar PSC devices based on TiO 2 electron transport layer.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yangyang Cai,Lai Xie,Zongbao Zhang,Yang Zhou,Hui Liu,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shu i,Sujuan Wu,Junming Liu
In order to optimize microstructure and improve the photoelectric properties of planar perovskite solar cells (PSCs), the Cs + and SCN − are selected to tune the A-site cation and X-site anion composition of CH 3 NH 3 PbI 3 material with ABX 3 structure, respectively. The effects of Cs + and SCN − addition on the microstructure and photoelectric properties of (CH 3 NH 3 ) 0.9 Cs 0.1 Pb(I 1-x SCN x ) 3 perovskite films and the performance of PSCs have been systematically investigated. The value of “x” corresponding to the amount of SCN − has been optimized. At the optimum amount of 0.05, the (CH 3 NH 3 ) 0.9 Cs 0.1 Pb(I 0.95 SCN 0.05 ) 3 (Cs 0.1 SCN 0.05 ) PSC achieve the champion power conversion efficiency (PCE) of 18.78% and average PCE of 17.66%, being much higher than that of the reference PSCs. The results indicate that the obtained Cs 0.1 SCN 0.05 perovskite film shows the improved microstructure, better local electric properties, the reduced trap density and suppressed charge recombination, resulting in the promoted carrier transfer and improved performance in PSCs.
研究领域:
材料科学
·
光伏技术
·
纳米科技
·
半导体物理
·
能源材料
·
表面科学
·
电化学
·
固体化学
✓ 已验证
DOI
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2016
·Vol. 48
·期 12
·1-10
·
IF 1.29
Zhang Chong-Zhen,Li Shu-Ti,He Miao,Yuan Song-Yang,Xia Chao,Song Wei-Dong,Hu Wen-Xiao,Qin Ping,Zhao Liang-Liang,Wang Ru-Peng
We report the effects of thermal flow air post-treatment on the performance of solution-processed CH 3 NH 3 PbI 3−x Cl x based planar solar cells under high relative humidity. It is found that the treatment process results in a significant enhancement in the power conversion efficiencies from 7.06 to 10.42%. The fill factor can be controlled in more than 0.7, with low values of the standard deviations. The change of shunt resistance and series resistance reflect that a high relative humid environment may be conducive to form good interfacial contact and decrease contact resistance of device, further enhance charge carrier lifetime among the layers interface, thus improving photovoltaic performance. Moreover, the PL intensity variations indicate that the appropriate temperature of thermal flow air post-treatment reducing the recombination of localized excitons of perovskite film, hence enhancing the charge separation and transport capability. Utilizing appropriate temperature thermal flow air post-treatment under high relative humidity, high efficiency solar cells with good reproducibility were achieved.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）