Xin Li

Huazhong University of Science and Technology | hust · School of Materials Science and Engineering

The interface energy level alignment modulation and charge carrier transportation play an important role in the device performance of perovskite solar cells (PSCs). Herein, tailored hydrophobic metal‐organic frameworks (MOFs) are employed as interfacial layers between perovskite absorbers and hole transport layers (HTLs). The tailored MOFs feature...

Introducing nanotwins in thermoelectric materials represents a promising approach to achieving such a synergistic combination of thermoelectric properties and mechanical properties. By increasing configurational entropy, a sharply reduced stacking fault energy in a new nanotwinned high‐entropy semiconductor AgMnGePbSbTe5 is reached. Dense coherent...

Self‐assembled monolayers (SAMs) employed in inverted perovskite solar cells (PSCs) have achieved groundbreaking progress in device efficiency and stability for both single‐junction and tandem configurations, owing to their distinctive and versatile ability to manipulate chemical and physical interface properties. In this regard, we present a compr...

Exploring N‐type High‐entropy materials with both high thermoelectric and mechanical properties is highly desirable for all‐high‐entropy thermoelectric generators (TEGs) since the thermoelectric and mechanical properties of N‐type one are largely behind its P‐type counterparts. Herein, a new rock‐salt structure N‐type high entropy thermoelectric Ag...

A high‐performance TiO2/GO‐Fe3+/2+‐based N‐type thermo‐electrochemical cell (TEC) is demonstrated and prepared P‐N combined power generator prototypes combining BST/FeCN3‐/4−‐based P‐type TEC that is reported in the previous work. The functional groups on the TiO2/GO in the electrolyte can adjust the solvation structure of Fe3+/2+ to improve the Se...

In the ever-evolving landscape of electronic cooling technologies, thermoelectric materials have emerged as crucial contenders for efficient heat dissipation. Bi 2 Te 3 -based materials are the most outstanding within the room temperature application....

The numerous defect‐induced non‐radiative recombination losses and residual stress in the preparation of perovskite film greatly hinder the further improvement of the efficiency and stability of flexible perovskite solar cells (PSCs). Here, a natural spice 7‐amino‐4‐(trifluoromethyl)‐2‐benzopyrone (ATB) containing amino (─NH2), carbonyl (─C═O), and...

The Bi0.5Sb1.5Te3 (BST) thin film shows great promise in harvesting low‐grade heat energy due to its excellent thermoelectric performance at room temperature. In order to further enhance its thermoelectric performance, specifically the power factor and output power, new approaches are highly desirable beyond the common “composition‐structure‐perfor...

Due to the increased integration and miniaturization of electronic devices, traditional electronic packaging materials, such as epoxy resin (EP), cannot solve electromagnetic interference (EMI) in electronic devices. Thus, the development of multifunctional electronic packaging materials with superior electromagnetic wave absorption (EMA), high hea...

Cu2SnS3 is a promising thermoelectric candidate for power generation at medium temperature due to its low‐cost and environmental‐benign features. However, the high electrical resistivity due to low hole concentration severely restricts its final thermoelectric performance. Here, analog alloying with CuInSe2 is first adopted to optimize the electric...

Defect-induced charge non-radiative recombination loss at perovskite/charge transport layers (CTLs) interfaces greatly deteriorates the efficiency and stability of flexible perovskite solar cells (PSCs). Therefore, a comprehensive strategy for reducing the defect density both at perovskite/CTLs interfaces is urgently required. Herein, the 1-[3-(Tri...

The improvement in the efficiency of inverted perovskite solar cells (PSCs) is significantly limited by undesirable contact at the NiOX/perovskite interface. In this study, a novel microstructure‐control technology is proposed for the fabrication of porous NiOX films using Pluronic P123 as the structure‐directing agent and acetylacetone (AcAc) as t...

Point defects play an import role in regulating the electrical and thermal transport properties of thermoelectric materials, but it always restricted by the solubility of dopant in the matrix. Herein,...

Energy usage in buildings accounts for 40% of global energy consumption, while windows are the least energy-efficient part of buildings. Photovoltaic smart window is an efficient way to improve efficiency of the window. In this work, we proposed a building-integrated photovoltaic (BIPV) smart window with energy modulation, energy generation, and lo...

The non-radiative recombination loss caused by diverse defects within SnO2 electron transport layer (ETL), perovskite film, and their interface greatly hinders the further improvement of the performance and stability of flexible perovskite solar cells (PSCs). Therefore, it is urgent to develop an effective strategy to address these issues. Herein,...

Interfacial defects at the electron transport layer (ETL) and perovskite interface significantly impact the interface carrier dynamics and thus the performance of planar perovskite solar cells. Here, a synergistic strategy has been proposed to compensate for oxygen vacancies and halogen vacancies at the ETL/perovskite interface by constructing a Na...

The severe non-radiative recombination loss caused by SnO2/perovskite interface defects greatly hinders the further improvement of the performance and stability of flexible perovskite solar cells (PSCs). Herein, a series of halides KM (M=F, Cl, Br, I) were inserted as interface layers to modulate the SnO2/perovskite interface. Both experimental and...

Electron transport layers (ETLs) are crucial for achieving efficient and stable planar perovskite solar cells (PSCs). Reports on versatile inorganic ETLs using a simple film fabrication method and applicability for both low‐cost planar regular and inverted PSCs with excellent efficiencies (> 22%) and high stability are very limited. Herein, we empl...

Reducing carrier recombination and facilitating charge extraction at the interface is of great significance to improve the device performance of perovskite solar cells (PSCs) towards commercial use. However, there has been little work done concerning transportation and recombination mechanism at the interface of the metal electrode and the electron...

Building-integrated solar cells not only generate electricity but also impact the envelope thermal characteristics, thus changing the micro-climate of buildings. Therefore, the collective effects of energy conservation and generation on buildings should be considered in one design. In this work, a smart photovoltaic window foil with near-infrared (...

The ETL/perovskite interface is crucial for the photovoltaic performance of perovskite solar cells (PSCs) because of its key role in electrons transport and charge recombination. Herein, an ultrathin CaTiO3 layer has facilely been fabricated and incorporated between the mp-TiO2 and perovskite layers. Due to the trap passivation effect and the optim...

Nowadays, all-inorganic CsPbBr3 perovskite is emerging to be an alternative light harvester in solar cells due to its excellent photoelectric property and superior stability under humidity and thermal attacks in comparison with organic-inorganic hybrid perovskites. However, the impure perovskite phase and severe interfacial charge recombination hav...

Pb-free MnTe has recently been discovered to be a promising thermoelectric material because of its low toxicity and eco-friendly nature. Here, we have proposed and demonstrated an effective approach to boost the electrical transport of MnTe compound via reinforcing bond covalency through M/S (alkaline dopants M = Li, Na, and K) co-doping. By means...

Environmental concern and high cost of some key components are the main obstacles to practical application of perovskite solar cells (PSCs). Herein, a novel, eco-friendly and lost-cost MnS film has been developed and employed as an efficient inorganic hole transport layer (HTL) of PSC for the first time via the technique of vacuum vapor deposition....

In this work, earth abundant CaI2 compound has been applied to regulate the thermoelectric performance of SnTe by co-doping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron doner nature of ITe+ point defects; on the other hand, the Seebeck coefficie...

α-MgAgSb (α-MAS) has recently been discovered to be a promising p-type thermoelectric (TE) material owing to its earth-abundant and nontoxic nature. However, However, there are two main disadvantages hindered the large-scale application of α-MAS,one is the single α-MAS phase prepared by conventional method requires for an extended period of time, a...

In this work, high mobility n-type SnS2 semiconductor films have been fabricated by vacuum deposition at room temperature and employed as the electron transport layer of flexible perovskite solar cells for the first time. The deposited SnS2 film exhibits homogeneous microstructure and good energy-level matching and presents a fast charge mobility a...

Here, the intellectual challenges for thermoelectric materials revolves around the strategy of point defect engineering to regulate the electrical and thermal transport nature of Mn1.06-xSnxTe (x = 0, 0.03, 0.035, 0.04, 0.045) materials. The power factor increases with substitution of Sn into the lattice of Mn1.06Te leading to enhance the carrier c...

Here, we demonstrate a facile strategy to enhance the efficiency and stability of perovskite solar cells (PKSCs) by modification the perovskite with a simple small molecule SnPc layer. A maximum PCE of 16.52% has been achieved in the modified PKSCs and it increases by 25% in compared with the pristine device (13.2%). The improvement of photovoltaic...

It is reported that MnTe doped with p-type Sb2Te3 shows an encouraging thermoelectric performance at elevated temperatures as in MnTe + x at% Sb2Te3 samples (x=0, 0. 5, 1, 1.5, 2) samples. After simultaneous introduction of holes, the Fermi level of MnTe shifts toward the valence band, which resulting the improved electrical performance. Whereas th...

In this work, we demonstrate a synergistic approach to improve the thermoelectric performance of InSb compound by introducing a replacement reaction of InSb and TiO2 during the hot pressed process. As a consequence of the replacement reaction, TiIn+ point defects, In2O3, stacking faults and InSb-Sb eutectic structures have been introduced into the...

The quality of interface between the electron transport layer (ETL) and perovskite is very crucial to the photovoltaic performance of a flexible perovskite solar cell fabricated under low-temperature process. This work demonstrates a room temperature ionic liquid modification strategy to the interface between ZnO layer and MAPbI3 film for high perf...

The effect of Al-, Ga- and In- doping on the thermoelectric (TE) properties of Cu3SbSe4 has been comparatively studied on the basis of theoretical prediction and experimental validation. It is found that tiny Al/Ga/In substitution leads to a great enhancement of electrical conductivity with high carrier concentration and also large Seebeck coeffici...

In this work, the thermoelectric properties of SnTe has been regulated synergistically by introduction of n-type ZnO nanoinclusions. On one hand, the excessive holes in SnTe matrix were compensated properly by n-type ZnO, and the Seebeck coefficient has been improved greatly due to the carrier energy filtering effect by a large quantity of ZnO-SnTe...

It is a challenge to optimize the coupled electrical and thermal transport properties of a thermoelectric material simultaneously. Here, the enhancement of overall thermoelectric properties in Cu3SbSe4 has been demonstrated through Te substitution. The results display that the simultaneous optimization of the Seebeck coefficient, electrical conduct...

Pristine MnTe is a p-type semiconductor with a relatively low hole concentration of 1018 cm-3 and electrical conductivity and thus poor TE performance at room temperature owing to the broad direct band gap of 1.27 eV. In this study, Na2S has been employed to dope into the MnTe matrix to tune the electrical and thermal transport properties synergist...

Owing to the advantage of low thermal conductivity, large Seebeck coefficient and multiple eco-friendly components constitution, Cu 2 CoSnS 4 (CCTS) might be a promising thermoelectric material. DFT calculations reveal that the multiple valence bands can be utilized to obtain an enhanced Seebeck coefficient and an improved power factor, and the rel...

In this study, ZnO/Zn2SnO4 (ZSO) composite is synthesized as a promising alternative compact layer to TiO2 by spray pyrolysis method. Owing to the ZnO/ZSO composite possesses higher carrier mobility and suitable band gap structure, it will behave well in the application of solar cells. The characterization results show that the ZnO/ZSO composite co...

By means of electrochemical atomic layer deposition (ECALD), cobalt selenide counter electrodes have been successfully prepared on FTO substrate for the first time. The as-grown films presented amorphous structure and their composition and microstructure could be regulated effectively by adjusting the depositing potential of Se via the route of ECA...

A new method has been proposed and verified to measure the Seebeck coefficient and electrical resistivity of a sample in the paper. Different from the conventional method for Seebeck coefficient and resistivity measurement, the new method adopts a four-point configuration to measure both the Seebeck coefficient and resistivity. It can well identify...

Developing high thermoelectric performance CuInTe2 based materials is technologically and environmentally intriguing, in order to achieve this, nanoscale heterostructure barrier blocking is proposed and adopted in this work by directly incorporating excess ZnX (X=S, Se) to regulate the electrical and thermal transport properties of CuInTe2. The res...

By dipping the mesoporous TiO2 film in Sr2+ solutions and subsequent annealing, a modification layer of SrTiO3 has been formed on the surface of the mesoporous TiO2 film, and the effect of modification on the photovoltaic characteristics of the perovskite solar cells has been studied detailedly. The XPS and TEM results verified the existence and na...

In this paper, a hybrid generator has been fabricated by connecting a dye sensitized solar cell (DSSC) with a single p–n junction thermoelectric generator (TEG) in series. Both the open-circuit voltage and the short circuit current of the hybrid generator have been enhanced obviously in comparison with the algebraic sum of those of the DSSC and TEG...

Ternary AgBiS2 quantum dots (QDs) were assembled onto TiO2 nanorods (NRs) film for QD-sensitized solar cell (QDSSC) application by a simple electrochemical atomic layer deposition method (ECALD). Various kinds of methods such as XRD, SEM, EDX and TEM were employed to characterize the structure and morphology of the deposits. The results indicate th...