Ruoxi Xia

South China University of Technology

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Hin‐Lap Yip

City University of Hong Kong

Yong Cao

Beihang University

Fei Huang

South China University of Technology

Hongzheng Chen

Zhejiang University

Chang‐Zhi Li

State Key Laboratory of Silicon Materials

Guichuan Zhang

South China University of Technology

Kai Zhang

South China University of Technology

Ziming Chen

South China University of Technology

Qifan Xue

South China University of Technology

Jingyang Xiao

South China University of Technology

Cooperative Institutions

South China University of Technology

Zhejiang University

Chinese Academy of Sciences

State Key Laboratory of Luminescent Materials and Devices

City University of Hong Kong

State Key Laboratory of Silicon Materials

Nankai University

Hangzhou Xixi hospital

Huazhong University of Science and Technology

Peking University

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High-performance see-through power windows

Energy & Environmental Science (2022)

Di Wang Yuhao Li Guanqing Zhou Emely Gu Ruoxi Xia

High-performance see-through power windows, derived from newly designed semitransparent organic solar modules, exhibit excellent energy generation and saving features.

10.1039/d2ee00977c

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Citations (76)

Dual Interfacial Modifications Enable High Performance Semitransparent Perovskite Solar Cells with Large Open Circuit Voltage and Fill Factor

Advanced Energy Materials (2016)

Qifan Xue Yang Bai Meiyue Liu Ruoxi Xia Zhicheng Hu

In this work, both anode and cathode interfaces of p‐i‐n CH 3 NH 3 PbI 3 perovskite solar cells (PVSCs) are simultaneously modified to achieve large open‐circuit voltage (V oc ) and fill factor (FF) for high performance semitransparent PVSCs (ST‐PVSCs). At the anode, modified NiO serves as an efficient hole transport layer with appropriate surface property to promote the formation of smooth perovskite film with high coverage. At the cathode, a fullerene bisadduct, C 60 (CH 2 )(Ind), with a shallow lowest unoccupied molecular orbital level, is introduced to replace the commonly used phenyl‐C 61 ‐butyric acid methyl ester (PCBM) as an alternative electron transport layer in PVSCs for better energy level matching with the conduction band of the perovskite layer. Therefore, the V oc , FF and power conversion efficiency (PCE) of the PVSCs increase from 1.05 V, 0.74 and 16.2% to 1.13 V, 0.80 and 18.1% when the PCBM is replaced by C 60 (CH 2 )(Ind). With the advantages of high V oc and FF, ST‐PVSCs are also fabricated using an ultrathin transparent Ag as cathode, showing an encouraging PCEs of 12.6% with corresponding average visible transmittance (AVT) over 20%. These are the highest PCEs reported for ST‐PVSCs with similar AVTs paving the way for using ST‐PVSCs as power generating windows.

Open-circuit voltage

Non-blocking I/O

10.1002/aenm.201602333

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Citations (229)

Semitransparent Organic Solar Cells Enabled by a Sequentially Deposited Bilayer Structure

ACS Applied Materials & Interfaces (2020)

Yu Song Kai Zhang Sheng Dong Ruoxi Xia Fei Huang

Semitransparent organic solar cells (ST-OSCs) have been regarded as a promising candidate for building integrated photovoltaics. In general, most of the ST-OSCs are based on a bulk heterojunction (BHJ) structure in which the morphology of the BHJ film must be delicately optimized. In this work, we introduce a sequentially deposited bilayer structure into ST-OSCs by using a PTB7-Th/IEICO-4F combination. The adoption of the bilayer structure not only simplifies the device optimization, but it is also found that, as the donor and the acceptor are separately deposited, the power conversion efficiency (PCE) of bilayer ST-OSCs can be improved by simply increasing the thickness of IEICO-4F, which has strong near infrared absorption but weak visible light absorption, without significantly affecting the average visible light transmittance (AVT) of the device. However, in the BHJ structure, the increase in BHJ film thickness unavoidably enhances the donor absorption in the visible light region, leading to a tradeoff between the PCE and AVT in BHJ-structured ST-OSCs. Eventually, the bilayer-structured device exhibits a better overall performance than the BHJ-structured device, e.g., a PCE of 8.5% for the bilayer structure versus a PCE of 8.1% for the BHJ structure with an AVT around 21%. Our findings indicate that the sequentially deposited bilayer structure, aside from its easy processing characteristics, also has great potential for preparing high-performance ST-OSCs.

Acceptor

10.1021/acsami.0c00396

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Citations (65)

Solar Cells: Dual Interfacial Modifications Enable High Performance Semitransparent Perovskite Solar Cells with Large Open Circuit Voltage and Fill Factor (Adv. Energy Mater. 9/2017)

Advanced Energy Materials (2017)

Qifan Xue Yang Bai Meiyue Liu Ruoxi Xia Zhicheng Hu

In article number 1602333, Shihe Yang, Yutaka Matsuo, Hin-Lap Yip, and co-workers simultaneously optimize both the power conversion efficiency (>12.5%) and average visible transmittance (>20%) of semitransparent perovskite solar cells (ST-PVSCs) through dual interfacial modifications. The success demonstration of high performance ST-PVSCs paves the way for using them as power generating windows, as illustrated in the image.

Open-circuit voltage

10.1002/aenm.201770047

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Citations (3)

Efficient monolithic perovskite/organic tandem solar cells and their efficiency potential

Nano Energy (2020)

Shenkun Xie Ruoxi Xia Zhen Chen Jingjing Tian Lei Yan

Tandem

Perovskite solar cell

Hybrid solar cell

10.1016/j.nanoen.2020.105238

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Citations (82)

Synergic Interface and Optical Engineering for High‐Performance Semitransparent Polymer Solar Cells

Advanced Energy Materials (2017)

Hui Shi Ruoxi Xia Chen Sun Jingyang Xiao Zhihong Wu

Abstract In this study the thickness of the PTB7‐Th:PC 71 BM bulk heterojunction (BHJ) film and the PF3N‐2TNDI electron transport layer (ETL) is systematically tuned to achieve polymer solar cells (PSCs) with optimized power conversion efficiency (PCE) of over 9% when an ultrathin BHJ of 50 nm is used. Optical modeling suggests that the high PCE is attributed to the optical spacer effect from the ETL, which not only maximizes the optical field within the BHJ film but also facilitates the formation of a more homogeneously distributed charge generation profile across the BHJ film. Experimentally it is further proved that the extra photocurrent produced at the PTB7‐Th/PF3N‐2TNDI interface also contributes to the improved performance. Taking advantage of this high performance thin film device structure, one step further is taken to fabricate semitransparent PSCs (ST‐PSCs) by using an ultrathin transparent Ag cathode to replace the thick Ag mirror cathode, yielding a series of high performance ST‐PSCs with PCEs over 6% and average visible transmittance between 20% and 30%. These ST‐PSCs also possess remarkable transparency color perception and rendering properties, which are state‐of‐the‐art and fulfill the performance criteria for potential use as power‐generating windows in near future.

Photocurrent

Active layer

Photoactive layer

10.1002/aenm.201701121

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Citations (54)

Tandem Organic Solar Cells with 18.7% Efficiency Enabled by Suppressing the Charge Recombination in Front Sub‐Cell

Advanced Functional Materials (2021)

Gongchu Liu Ruoxi Xia Qiri Huang Kai Zhang Zhicheng Hu

Abstract The maximum photocurrent in tandem organic solar cells (TOSCs) is often obtained by increasing the thicknesses of sub‐cells, which leads to recombination enhancement of such devices and compromises their power conversion efficiency (PCE). In this work, an efficient interconnecting layer (ICL) is developed, with the structure ZnO NPs:PEI/PEI/PEDOT:PSS, which enables TOSCs with very good reproducibility. Then, it is discovered that the optimal thickness of the front sub‐cell in such TOSCs can be reduced by increasing the proportion of a non‐fullerene acceptor in the active layer. The non‐fullerene acceptor used in this work has a much larger absorption coefficient than the donor in the front sub‐cell, and the absorption reduction of donor can be well complemented by that of the acceptor when increasing the acceptor proportion, thus leading to a significant overall absorption enhancement even with a thinner film. As a result, the optimal thickness of the front sub‐cell is reduced and its charge recombination is suppressed. Ultimately, the use of this ICL combined with fine‐turning of the composition in the front sub‐cell enables an efficient TOSC with a very high fill factor of 78% and an excellent PCE of 18.71% (certified by an accredited institute to be 18.09%) to be obtained.

Tandem

Photocurrent

Acceptor

Active layer

Diphenylamine

10.1002/adfm.202103283

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Citations (101)

Organic and solution-processed tandem solar cells with 17.3% efficiency

Science (2018)

Lingxian Meng Yamin Zhang Xiangjian Wan Chenxi Li Xin Zhang

Although organic photovoltaic (OPV) cells have many advantages, their performance still lags far behind that of other photovoltaic platforms. A fundamental reason for their low performance is the low charge mobility of organic materials, leading to a limit on the active-layer thickness and efficient light absorption. In this work, guided by a semi-empirical model analysis and using the tandem cell strategy to overcome such issues, and taking advantage of the high diversity and easily tunable band structure of organic materials, a record and certified 17.29% power conversion efficiency for a two-terminal monolithic solution-processed tandem OPV is achieved.

Tandem

10.1126/science.aat2612

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Citations (2,409)

Utilization of Trapped Optical Modes for White Perovskite Light-Emitting Diodes with Efficiency over 12%

Joule (2021)

Ziming Chen Zhenchao Li Zhen Chen Ruoxi Xia Guangruixing Zou

White (mutation)

10.1016/j.joule.2020.12.008

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Citations (105)

Highly Transparent Organic Solar Cells with All‐Near‐Infrared Photoactive Materials

Small Methods (2019)

Yuanpeng Xie Ruoxi Xia Tengfei Li Linglong Ye Xiaowei Zhan

Abstract Transparent organic photovoltaics are identified as important components for building‐integrated photovoltaics and smart window technologies. In this work, highly transparent organic solar cells (T‐OSCs) based on all‐near‐infrared (NIR) harvesting materials (optical bandgap, < 1.4 eV) are first fabricated. Both donor and acceptor materials used in T‐OSCs exhibit great transparency in the visible region. After combining MoO 3 /Ag or MoO 3 /Ag/MoO 3 transparent electrode, T‐OSCs show excellent visible light transmittance (VLT) of 52–61.5% with power conversion efficiencies of 3.5–4.2%. As far as it is known, this all‐NIR active layer represents the most visible transparent donor–acceptor combination in OSCs. In addition to high VLT, T‐OSCs have great aesthetic value, good color‐rendering index (CRI > 90), and high light energy utilization properties. This work highlights great potential of NIR photoactive materials for T‐OSCs.

Photoactive layer

Active layer

Visible spectrum

Acceptor

Color rendering index

10.1002/smtd.201900424

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Citations (66)