Modulation of Majority Charge Carrier from Hole to Electron by Incorporation of Cyano Groups in Diketopyrrolopyrrole-Based Polymers

2017 ◽  
Vol 50 (19) ◽  
pp. 7550-7558 ◽  
Author(s):  
Hee Su Kim ◽  
Gunel Huseynova ◽  
Yong-Young Noh ◽  
Do-Hoon Hwang
Keyword(s):  
Charge Carrier ◽  
Majority Charge Carrier ◽  
Cyano Groups

Hot-Probe Method for Majority Charge Carrier Determination in Methylammonium Lead Halide Perovskites

2021 ◽  
Vol 11 (2) ◽  
pp. 368-373
Author(s):  
Saeed Fathi ◽  
Elnaz Bagherzadeh-khajehmarjan ◽  
Arash Nikniazi ◽  
Babak Olyaeefar ◽  
Sohrab Ahmadi-kandjani
Keyword(s):  
Charge Carrier ◽  
Probe Method ◽  
Majority Charge Carrier ◽  
Halide Perovskites ◽  
Hot Probe ◽  
Lead Halide

scholarly journals Impact of K+ Doping on Modulating Majority Charge Carrier Type and Quality of Perovskite Thin Films by Two-step Solution Method for Solar Cells

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 647 ◽  
Author(s):  
Yujun Yao ◽  
Xiaoping Zou ◽  
Jin Cheng ◽  
Tao Ling ◽  
Chuangchuang Chang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solar Cells ◽  
Charge Carrier ◽  
Physical Properties ◽  
Perovskite Solar Cells ◽  
Tio2 Layer ◽  
Perovskite Layer ◽  
Majority Charge Carrier ◽  
Majority Carrier

Traditional hetero-junction perovskite solar cells are composed of light-absorbing layers, charge carrier-transporting layers, and electrodes. Recently, a few papers on homo-junction perovskite solar cells have been studied. Here, we studied the effect of K+ doping on TiO2/PbI2 interface quality, perovskite film morphology, photo-physical properties, and majority carrier type. In particular, the K+ extrinsic doping can modulate the majority carrier type of the perovskite thin film. The study indicated that the interface between the perovskite layer and the TiO2 layer deteriorates with the increase of K+ doping concentration, affecting the electron transport ability from the perovskite film to the TiO2 layer and the photo-physical properties of the perovskite layer by K+ doping. In addition, the majority charge carrier type of perovskite thin films can be changed from n-type to p-type after K+ extrinsic doping, and the corresponding hole concentration increased to 1012 cm−3. This approach of modulating the majority charge carrier type of perovskite thin film will pave the way for the investigation of perovskite homo-junction by extrinsic doping for solar cells.

scholarly journals Majority Charge Carrier Transport in Particle-Based Photoelectrodes

2019 ◽  
Vol 123 (43) ◽  
pp. 26082-26094
Author(s):  
Yannick K. Gaudy ◽  
Stefan Dilger ◽  
Simone Pokrant ◽  
Sophia Haussener
Keyword(s):  
Charge Carrier ◽  
Carrier Transport ◽  
Charge Carrier Transport ◽  
Majority Charge Carrier

Majority charge carrier reversal and its effect on thermal and electron transport in xV2O5–(1−x) As2O3 glasses

2012 ◽  
Vol 358 (6-7) ◽  
pp. 1019-1027 ◽  
Author(s):  
Sezhian Annamalai ◽  
Rudra P. Bhatta ◽  
Ian L. Pegg ◽  
Biprodas Dutta
Keyword(s):  
Electron Transport ◽  
Charge Carrier ◽  
Majority Charge Carrier

Characterization of electrochemical photovoltaic cells using polycrystalline CdSe and CdTe electrodes grown by a liquid metal-vapor reaction

1991 ◽  
Vol 6 (6) ◽  
pp. 1293-1299 ◽  
Author(s):  
Zhitsing Deng ◽  
Michelina Cinquino ◽  
Marcus F. Lawrence
Keyword(s):  
Liquid Metal ◽  
Charge Carrier ◽  
Conversion Efficiency ◽  
Carrier Density ◽  
Metal Vapor ◽  
Light Illumination ◽  
Textured Surface ◽  
Charge Carrier Density ◽  
Experimental Conditions ◽  
Majority Charge Carrier

Polycrystalline CdSe and CdTe layers were fabricated by putting liquid Cd in contact with Se or Te vapors under constant Ar flow. The crystalline structure, surface properties, and semiconducting properties of these materials have been determined. Both materials were found to be n-type semiconductors. The results show that, under the proper experimental conditions, the liquid metal-vapor reaction enables the synthesis of polycrystalline CdSe photoelectrodes with a 6.9% energy conversion efficiency when used in an electrochemical photovoltaic cell under 80 mW/cm2 of white light illumination. This efficiency rates amongst the highest ones measured under similar conditions using polycrystalline CdSe. These CdSe layers have a majority charge carrier density of ND = 2.6 × 1017 cm−3 and possess a highly textured surface which is assumed to be mainly responsible for the high photovoltaic efficiency. The highly textured CdTe samples obtained by this process, however, show a photovoltaic conversion efficiency of only 0.2%, and this is seen to be mainly due to their high majority charge carrier density of ND = 7.8 × 1019 cm−3.

Theoretical design of benzo[1,2-b:3,4-b′:5,6-b′′]tristhianaphthene and its derivatives as high performance organic semiconductors

2015 ◽  
Vol 14 (07) ◽  
pp. 1550058 ◽  
Author(s):  
Jun Yin ◽  
Kadali Chaitanya ◽  
Xue-Hai Ju
Keyword(s):  
Charge Carrier ◽  
Charge Transport ◽  
Transport Properties ◽  
Organic Semiconductors ◽  
High Performance ◽  
Reorganization Energy ◽  
Molecular Structures ◽  
Geometrical Structures ◽  
Subtle Change ◽  
Cyano Groups

In order to probe the effects of substituents (F and CN) attached to benzo[1,2-b:3,4-[Formula: see text]:5,6-[Formula: see text]]tristhianaphthene (BTTP) on their charge carrier transport properties, we investigated the characteristics of molecular structures and charge transport properties of BTTP and its derivatives (BTTP1, BTTP2, BTTP3, BTTP4, and BTTP5). Six crystal structures were predicted by the Monte Carlo-simulated annealing method with the embedded electrostatic potential charges method. Even a subtle change of geometrical structures may result in a great change of the reorganization energy. With increasing numbers of substituted fluorine atoms, the reorganization energy of the BTTP derivative increases, which is disadvantageous to the electron transport. In contrast, the attachment of the electron-withdrawing cyano groups to BTTP decreases the reorganization energy and raises the electron affinity, which is beneficial to electron injection and charge carrier stabilization. The introduction of cyano groups also results in an enhancement of [Formula: see text]–[Formula: see text] interaction and leads to an increase in the transfer integrals. Among the six compounds, the novel compound BTTP4 has the largest electron mobility (1.154[Formula: see text]cm[Formula: see text]) on account of its larger transfer integral and smaller reorganization energy, indicating that BTTP4 is a promising high-performance n-type organic semiconductor and worth to synthesize. The analysis of angular-resolution anisotropic mobilities for the BTTP and BTTP4 shows that it is helpful to control the orientations of the conducting channels for a better charge transport efficiency. This work provides a rational strategy for the design of high-performance n-type organic semiconductors from molecule to crystal structure.

Sign in / Sign up

Export Citation Format

Share Document