scholarly journals Quantifying Efficiency Loss of Perovskite Solar Cells by a Modified Detailed Balance Model

2017 ◽  
Vol 8 (8) ◽  
pp. 1701586 ◽  
Author(s):  
Wei E. I. Sha ◽  
Hong Zhang ◽  
Zi Shuai Wang ◽  
Hugh L. Zhu ◽  
Xingang Ren ◽  
...  
Keyword(s):  
Solar Cells ◽  
Detailed Balance ◽  
Perovskite Solar Cells ◽  
Balance Model ◽  
Efficiency Loss

scholarly journals The Influence of Solar Spectrum and Concentration Factor on the Material Choice and the Efficiency of Multijunction Solar Cells

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Daniel N. Micha ◽  
Ricardo T. Silvares Junior
Keyword(s):  
Solar Cells ◽  
Concentration Factor ◽  
Detailed Balance ◽  
Solar Spectrum ◽  
Theoretical Method ◽  
Balance Model ◽  
Bandgap Energy ◽  
Multijunction Solar Cells ◽  
Material Choice ◽  
Conversion Efficiencies

AbstractIn this work, we revisit the theoretical study on the conversion efficiency of series-connected multijunction solar cells. The theoretical method, based on the detailed balance model, is then applied to devices with 2 to 6 junctions under different illumination conditions. As results, (i) we show that the peaks in the efficiency distribution occur for recurrent values of bottom junction bandgap energy corresponding to atmospheric absorption in the solar spectrum, and (ii) we demonstrate that variations in the number of junctions, in the incident solar spectrum, and in the concentration factor lead to changes in the optimum bandgap energy set but that the bottom junction bandgap energy only changes among the recurrent values presented before. Additionally, we highlight that high conversion efficiencies take place for a broad distribution of bandgap energy combination, which make the choice of materials for the device more flexible. Therefore, based on the overall results, we propose more than a hundred III-V, II-VI and IV semiconductor material candidates to compose the bottom junction of highly efficient devices.

Surface & grain boundary co-passivation by fluorocarbon based bifunctional molecules for perovskite solar cells with efficiency over 21%

2019 ◽  
Vol 7 (6) ◽  
pp. 2497-2506 ◽  
Author(s):  
Pengfei Guo ◽  
Qian Ye ◽  
Xiaokun Yang ◽  
Jin Zhang ◽  
Fei Xu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Grain Boundary ◽  
Perovskite Solar Cells ◽  
Effective Strategy ◽  
Efficiency Loss ◽  
Bifunctional Molecules ◽  
Improved Stability

An effective strategy of surface & grain boundary co-passivation is demonstrated to access perovskite solar cells with 21.31% champion efficiency as well as a highly improved stability of less than 3% efficiency loss after 2500 hours at a humidity of 70%.

scholarly journals Detailed balance calculations for hot-carrier solar cells: coupling high absorptivity with low thermalization through light trapping

2019 ◽  
Vol 10 ◽  
pp. 1
Author(s):  
Maxime Giteau ◽  
Daniel Suchet ◽  
Stéphane Collin ◽  
Jean-François Guillemoles ◽  
Yoshitaka Okada
Keyword(s):  
Solar Cells ◽  
Chemical Potential ◽  
Light Trapping ◽  
Detailed Balance ◽  
Open Circuit ◽  
Balance Model ◽  
Continuous Illumination ◽  
Efficiency Gain ◽  
Hot Carrier ◽  
Carrier Population

Hot-carrier solar cells could enable an efficiency gain compared to conventional cells, provided that a high current can be achieved, together with a hot-carrier population. Because the thermalization rate is proportional to the volume of the absorber, a fundamental requirement is to maximize the density of carriers generated per volume unit. In this work, we focus on the crucial role of light trapping to meet this objective. Using a detailed balance model taking into account losses through a thermalization factor, we obtained parameters of the hot-carrier population generated under continuous illumination. Different absorptions corresponding to different light path enhancements were compared. Results are presented for open-circuit voltage, at maximum power point and as a function of the applied voltage. The relation between the parameters of the cell (thermalization rate and absorptivity) and its characteristics (temperature, chemical potential, and efficiency) is explained. In particular, we clarify the link between absorbed light intensity and chemical potential. Overall, the results give quantitative values for the thermalization coefficient to be achieved and show that in the hot-carrier regime, absorptivity enhancement leads to an important increase in the carrier temperature and efficiency.

scholarly journals Detailed balance model for intermediate band solar cells with photon conservation

2011 ◽  
Vol 19 (18) ◽  
pp. 16927 ◽  
Author(s):  
Chien-chung Lin ◽  
Wei-Ling Liu ◽  
Ching-Yu Shih
Keyword(s):  
Solar Cells ◽  
Detailed Balance ◽  
Balance Model ◽  
Intermediate Band ◽  
Intermediate Band Solar Cells

Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells

2015 ◽  
Vol 25 (25) ◽  
pp. 3925-3933 ◽  
Author(s):  
Yong Hui Lee ◽  
Jingshan Luo ◽  
Robin Humphry-Baker ◽  
Peng Gao ◽  
Michael Grätzel ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Efficiency Loss

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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