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Title: Thermodynamic limit of bifacial double-junction tandem solar cells

Here, a traditional single-junction solar panel cannot harness ground-scattered light (albedo reflectance, R A), and also suffers from the fundamental sub-band-gap and the thermalization losses. In this paper, we explain how a “bifacial tandem” panel would dramatically reduce these losses, with corresponding improvement in thermodynamic performance. Our study predicts (i) the optimum combination of the band-gaps, empirically given by E opt g(t) ≈ E opt g(b) (2+R A)/3+(1–R A) and the (ii) corresponding optimum normalized output power given by η* T(opt) ≈ R A (2η SJ(opt)) + (1–R ADJ(opt). Empirically, η* T(opt) interpolates between the thermodynamic efficiency limit of classical double-junction tandem cell (η DJ) and twice that of a single-junction cell (η SJ). We conclude by explaining how the fundamental loss mechanisms evolve with R A in a bifacial tandem cell.
Authors:
ORCiD logo [1] ;  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Grant/Contract Number:
EE0004946; AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 22; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Leland Stanford Junior Univ., Palo Alto, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY
OSTI Identifier:
1468448
Alternate Identifier(s):
OSTI ID: 1227338

Khan, M. Ryyan, and Alam, Muhammad A.. Thermodynamic limit of bifacial double-junction tandem solar cells. United States: N. p., Web. doi:10.1063/1.4936341.
Khan, M. Ryyan, & Alam, Muhammad A.. Thermodynamic limit of bifacial double-junction tandem solar cells. United States. doi:10.1063/1.4936341.
Khan, M. Ryyan, and Alam, Muhammad A.. 2015. "Thermodynamic limit of bifacial double-junction tandem solar cells". United States. doi:10.1063/1.4936341. https://www.osti.gov/servlets/purl/1468448.
@article{osti_1468448,
title = {Thermodynamic limit of bifacial double-junction tandem solar cells},
author = {Khan, M. Ryyan and Alam, Muhammad A.},
abstractNote = {Here, a traditional single-junction solar panel cannot harness ground-scattered light (albedo reflectance, RA), and also suffers from the fundamental sub-band-gap and the thermalization losses. In this paper, we explain how a “bifacial tandem” panel would dramatically reduce these losses, with corresponding improvement in thermodynamic performance. Our study predicts (i) the optimum combination of the band-gaps, empirically given by Eoptg(t) ≈ Eoptg(b) (2+RA)/3+(1–RA) and the (ii) corresponding optimum normalized output power given by η*T(opt) ≈ RA (2ηSJ(opt)) + (1–RA)ηDJ(opt). Empirically, η*T(opt) interpolates between the thermodynamic efficiency limit of classical double-junction tandem cell (ηDJ) and twice that of a single-junction cell (ηSJ). We conclude by explaining how the fundamental loss mechanisms evolve with RA in a bifacial tandem cell.},
doi = {10.1063/1.4936341},
journal = {Applied Physics Letters},
number = 22,
volume = 107,
place = {United States},
year = {2015},
month = {11}
}