Query: tandem organic solar cell

Candidate papers:

abstract: Tailoring tandem organics Tandem solar cells can boost efficiency by using a wider range of the solar spectrum. The bandgap of organic semiconductors can be tuned over a wide range, but, for a two terminal device that directly connects the cells, the currents produced must be nearly equal. Meng et al. used a semiempirical analysis to choose well matched top and bottom cell active layers. They used solution processing to fabricate an inverted tandem device that has a power conversion efficiency as high as 17.4% Science, this issue p. 1094 A semi empirical analysis helped to optimize materials for a tandem organic solar cell with high power conversion efficiency. 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.
author_names: Lingxian Meng

Yamin Zhang

Xiangjian Wan

Chenxi Li

Xin Zhang

Yanbo Wang

Xin Ke

Zuo Xiao

Liming Ding

Ruoxi Xia

Hin-Lap Yip

Yong Cao

Yongsheng Chen
title: Organic and solution processed tandem solar cells with 17.3% efficiency
venue: Science
year: 2018

abstract: Fabricating organic solar cells (OSCs) with a tandem structure has been considered an effective method to overcome the limited light absorption spectra of organic photovoltaic materials. Currently, the most efficient tandem OSCs are fabricated by adopting fullerene derivatives as acceptors. In this work, we designed a new non fullerene acceptor with an optical band gap (Egopt) of 1.68 eV for the front subcells and optimized the phase separation morphology of a fullerene free active layer with an Egopt of 1.36 eV to fabricate the rear subcell. The two subcells show a low energy loss and high external quantum efficiency, and their photoresponse spectra are complementary. In addition, an interconnection layer (ICL) composed of ZnO and a pH neutral self doped conductive polymer, PCP Na, with high light transmittance in the near IR range was developed. From the highly optimized subcells and ICL, solution processed fullerene free tandem OSCs with an average power conversion efficiency (PCE) greater than 13% were obtained.
author_names: Yong Cui

Huifeng Yao

Bowei Gao

Yunpeng Qin

Shaoqing Zhang

Bei Yang

Chang He

Bowei Xu

Jianhui Hou
title: Fine Tuned Photoactive and Interconnection Layers for Achieving over 13% Efficiency in a Fullerene Free Tandem Organic Solar Cell.
venue: Journal of the American Chemical Society
year: 2017

abstract: We present a cost analysis based on state of the art printing and coating processes to fully encapsulated, flexible ITO and vacuum free polymer solar cell modules. Manufacturing data for both single junctions and tandem junctions are presented and analyzed. Within this calculation the most expensive layers and processing steps are identified. Based on large roll to roll coating experiments the exact material consumptions were determined. In addition to the data for the pilot scale experiment presented here, projections to medium and large scale scenarios serve as a guide to achieve cost targets of 5 EURct per Wp in a detailed material and cost analysis. These scenarios include the replacement of cost intensive layers, as well as process optimization steps. Furthermore, the cost structures for single and tandem devices are listed in detail and discussed. In an optimized model the material costs drop below 10 EUR per m2 which proves that OPV is a competitive alternative to established power generation technologies.
author_names: Florian Machui

Markus Hosel

Ning Li

George D Spyropoulos

Tayebeh Ameri

Roar R Sondergaard

Mikkel Jorgensen

Arnulf Scheel

Detlef Gaiser

Kilian Kreul

Daniel Lenssen

Mathilde Legros

Noella Lemaitre

Marja Vilkman

Marja K Valimaki

Sirpa Nordman

Christoph J Brabec

Frederik C Krebs
title: Cost analysis of roll to roll fabricated ITO free single and tandem organic solar modules based on data from manufacture
year: 2014

abstract: Inline printing and coating methods have been demonstrated to enable a high technical yield of fully roll to roll processed polymer tandem solar cell modules. We demonstrate generality by employing different material sets and also describe how the ink systems must be carefully co developed in order to reach the ambitious objective of a fully printed and coated 14 layer flexible tandem solar cell stack. The roll to roll methodologies involved are flexographic printing, rotary screen printing, slot die coating, X ray scattering, electrical testing and UV lamination. Their combination enables the manufacture of completely functional devices in exceptionally high yields. Critical to the ink and process development is a carefully chosen technology transfer to industry method where first a roll coater is employed enabling contactless stack build up, followed by a small roll to roll coater fitted to an X ray machine enabling in situ studies of wet ink deposition and drying mechanisms, ultimately elucidating how a robust inline processed recombination layer is key to a high technical yield. Finally, the transfer to full roll to roll processing is demonstrated.
author_names: Thomas R Andersen

Henrik Friis Dam

Markus Hosel

Martin Helgesen

Jon Eggert Carle

Thue Trofod Larsen-Olsen

S A Gevorgyan

Jens Wenzel Andreasen

Jens Adams

Ning Li

Florian Machui

George D Spyropoulos

Tayebeh Ameri

Noella Lemaitre

Mathilde Legros

Arnulf Scheel

Detlef Gaiser

Kilian Kreul

Stephane Berny

O R Lozman

Sirpa Nordman

Marja K Valimaki

Marja Vilkman

Roar R Sondergaard

Mikkel Jorgensen

Christoph J Brabec

Frederik C Krebs
title: Scalable, ambient atmosphere roll to roll manufacture of encapsulated large area, flexible organic tandem solar cell modules
year: 2014

abstract: As single junction photovoltaic (PV) technologies, both Si heterojunction (HIT) and perovskite based solar cells promise high efficiencies at low cost. Intuitively, a traditional tandem cell design with these cells connected in series is expected to improve the efficiency further. Using a self consistent numerical modeling of optical and transport characteristics, however, we find that a traditional series connected tandem design suffers from low JSC due to band gap mismatch and current matching constraints. Specifically, a traditional tandem cell with state of the art HIT e=24% and perovskite e=20% sub cells provides only a modest tandem efficiency of eT~ 25% Instead, we demonstrate that a bifacial HIT/perovskite tandem design decouples the optoelectronic constraints and provides an innovative path for extraordinary efficiencies. In the bifacial configuration, the same state of the art sub cells achieve a normalized output of eT* 33% exceeding the bifacial HIT performance at practical albedo re.
author_names: Reza Asadpour

Raghu Vamsi Krishna Chavali

M Ryyan Khan

Muhammad A Alam
title: Bifacial Si heterojunction perovskite organic inorganic tandem to produce highly efficient eT* 33% solar cell
year: 2015

abstract: <jats:p><jats:fig position="anchor"<jats:graphic xmlns:xlink="http:/www.w3.org/1999/xlink" orientation="portrait" mime subtype="jpeg" mimetype="image" position="float" xlink:type="simple" xlink:href="S0884291419001687_figAb" /jats:fig>/jats:p>
author_names: Zenan Jiang

Bobak Gholamkhass

Peyman Servati
title: Effects of interlayer properties on the performance of tandem organic solar cells with low and high band gap polymers
venue: Journal of Materials Research
year: 2019

abstract: Fabricating solar cells with tandem structure is an efficient way to broaden the photon response range without further increasing the thermalization loss in the system. In this work, a tandem organic solar cell (TOSC) based on highly efficient nonfullerene acceptors (NFAs) with series connection type is demonstrated. To meet the different demands of front and rear sub cells, two NFAs named F M and NOBDT with a whole absorption range from 300 to 900 nm are designed, when blended with wide bandgap polymer poly[(2,6 (4,8 bis(5 (2 ethylhexyl)thiophen 2 yl) benzo[1,2 b:4,5 b']dithiophene) alt (5,5 (1',3' di 2 thienyl 5',7' bis(2 ethylhexyl)benzo[1',2' c:4',5' c']dithiophene 4,8 dione) (PBDB T) and narrow bandgap polymer PTB7 Th, respectively, the PBDB T: F M system exhibits a high Voc of 0.98 V and the PTB7 Th: NOBDT system shows a remarkable Jsc of 19.16 mA cm 2 which demonstrate their potential in the TOSCs. With the guidance of optical simulation, by systematically optimizing the thickness of each layer in the TOSC, an outstanding power conversion efficiency of 14.11% with a Voc of 1.71 V, a Jsc of 11.72 mA cm 2 and a satisfactory fill factor of 0.70 is achieved; this result is one of the top efficiencies reported to date in the field of organic solar cells.
author_names: Yamin Zhang

Bin Kan

Yanna Sun

Yanbo Wang

Ruoxi Xia

Xin Ke

Yuan-Qiu-Qiang Yi

Chenxi Li

Hin-Lap Yip

Xiangjian Wan

Yong Cao

Yongsheng Chen
title: Nonfullerene Tandem Organic Solar Cells with High Performance of 14.11.
venue: Advanced materials
year: 2018

abstract: The great challenge to improve the performance of a tandem organic solar cell is how we can measure the true behavior of its individual sub cells. In this work, we develop a new architecture of the tandem solar cell to directly and accurately measure I V and quantum efficiency of the individual sub cells by using a very thin, semi transparent metal interlayer with different surface modification as anode and cathode. Separate measurements of reference cells are used in the conventional method to evaluate the contribution of every individual sub cell in a tandem structure. The discrepancy between the summations of two individual sub cells in a tandem device and the sum of conventional two reference cells is significant. This great discrepancy is mainly ascribed to the light trapping effect from the rough silver interlayer connection. This work demonstrates that direct measuring of individual sub cells in a tandem structure is the only way to evaluate the true contribution of each sub cell, thus having important impact on the study of fundamentals and on the improvement of tandem solar cells.
author_names: Hong Bin Yang

Qunliang Song

Chang Ming Li

Zhisong Lu
title: New architecture for accurate characterization of the behavior of individual sub cells within a tandem organic solar cell
year: 2008

abstract: Tandem type organic solar cell consisting of two combined unit cells was fabricated. Each unit cell was two layer organic solar cell composed of metal free phthalocyanine and perylene tetracarboxylic derivative. When ultra thin Au layer was inserted between unit cells, photovoltage increased about 2 times, while photocurrent density was much dependent on the thickness of the inserted Au layer.
author_names: Masahiro Hiramoto

Minoru Suezaki

Masaaki Yokoyama
title: Effect of Thin Gold Interstitial layer on the Photovoltaic Properties of Tandem Organic Solar Cell
year: 1990

abstract: Abstract Tandem structures can boost the efficiency of organic solar cell to more than 15% compared to the 10% limit of single layer bulk heterojunction devices. Design and fabricating of intermediate layers plays a very important role to achieve high device performance. This article will review the main experimental progresses of tandem organic solar cells, and focus on the intermediate layers (charge recombination layers) in both thermal evaporated and solution processed organic tandem solar cell devices.
author_names: Yongbo Yuan

Jinsong Huang

Gang Li
title: Intermediate Layers in Tandem Organic Solar Cells
year: 2011