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abstract: Summary Recently, non fullerene n type organic semiconductors have attracted significant attention as acceptors in organic photovoltaics (OPVs) due to their great potential to realize high power conversion efficiencies. The rational design of the central fused ring unit of these acceptor molecules is crucial to maximize device performance. Here, we report a new class of non fullerene acceptor, Y6, that employs a ladder type electron deficient core based central fused ring (dithienothiophen[3.2 b] pyrrolobenzothiadiazole) with a benzothiadiazole (BT) core to fine tune its absorption and electron affinity. OPVs made from Y6 in conventional and inverted architectures each exhibited a high efficiency of 15.7% measured in two separate labs. Inverted device structures were certified at Enli Tech Laboratory demonstrated an efficiency of 14.9% We further observed that the Y6 based devices maintain a high efficiency of 13.6% with an active layer thickness of 300 nm. The electron deficient core based fused ring reported in this work opens a new door in the molecular design of high performance acceptors for OPVs.
author_names: Jun Yuan

Yunqiang Zhang

Liuyang Zhou

Guichuan Zhang

Hin-Lap Yip

Tsz-Ki Lau

Xinhui Lu

Can Zhu

Hongjian Peng

Paul A Johnson

Mario Leclerc

Yong Cao

Jacek Ulanski

Yongfang Li

Yingping Zou
title: Single Junction Organic Solar Cell with over 15% Efficiency Using Fused Ring Acceptor with Electron Deficient Core
venue: Joule
year: 2019

author_names: Martin A Green

Ewan D Dunlop

Jochen Hohl-Ebinger

Masahiro Yoshita

Nikos Kopidakis

Anita W Y Ho-baillie
title: Solar cell efficiency tables (Version 55)
year: 2019

author_names: Martin A Green

Ewan D Dunlop

Jochen Hohl-Ebinger

Masahiro Yoshita

Nikos Kopidakis

Xiaojing Hao
title: Solar cell efficiency tables (version 56)
year: 2020

abstract: Similar and indeterminate defect detection of solar cell surface with heterogeneous texture and complex background is a challenge of solar cell manufacturing. The traditional manufacturing process relies on human eye detection which requires a large number of workers without a stable and good detection effect. In order to solve the problem, a visual defect detection method based on multi spectral deep convolutional neural network (CNN) is designed in this paper. Firstly, a selected CNN model is established. By adjusting the depth and width of the model, the influence of model depth and kernel size on the recognition result is evaluated. The optimal CNN model structure is selected. Secondly, the light spectrum features of solar cell color image are analyzed. It is found that a variety of defects exhibited different distinguishable characteristics in different spectral bands. Thus, a multi spectral CNN model is constructed to enhance the discrimination ability of the model to distinguish between complex texture background features and defect features. Finally, some experimental results and K fold cross validation show that the multi spectral deep CNN model can effectively detect the solar cell surface defects with higher accuracy and greater adaptability. The accuracy of defect recognition reaches 94.30% Applying such an algorithm can increase the efficiency of solar cell manufacturing and make the manufacturing process smarter.
author_names: Haiyong Chen

Yue Pang

Qidi Hu

Kun Liu
title: Solar cell surface defect inspection based on multispectral convolutional neural network
venue: J. Intell. Manuf.
year: 2020

abstract: A green, efficient and stable solar cell based only on water and safe and cheap elements of the periodic table is proposed in this work, finally consolidating (also from a sustainability viewpoint) the concept of "artificial photosynthesis" studied for decades by the scientific community. The concept of dye sensitized solar cells is re proposed here with a metal free organic dye, an iodine based electrolyte in a 100% aqueous environment and a new cathode (cationic PEDOT) synthesized for the first time with the aim of inhibiting the repulsion between the anions of redox couples and the PEDOT:PSS matrix commonly used as the counter electrode. This elegant setup leads to a record efficiency of 7.02% the highest value ever obtained for a water based solar cell and, in general, for a photovoltaic device free of both organic solvents and expensive/heavy metals.
author_names: Federico Bella

Luca Porcarelli

Daniele Mantione

Claudio Gerbaldi

Claudia Barolo

Michael Gratzel

David Mecerreyes
title: A water based and metal free dye solar cell exceeding 7% efficiency using a cationic poly(3,4 ethylenedioxythiophene) derivative+
venue: Chemical science
year: 2020

abstract: With the recent emergence of a new class of high performance nonfullerene acceptors (NFAs) organic solar cells (OSCs) have entered a new phase of research featuring high power conversion efficienc.
author_names: Shuixing Li

Changzhi Li

Minmin Shi

Hongzheng Chen
title: New Phase for Organic Solar Cell Research: Emergence of Y Series Electron Acceptors and Their Perspectives
year: 2020

abstract: Two dimensional Ruddlesden Popper phase (2DRP) perovskites are known to exhibit improved photostability and environmental stability compared with their three dimensional (3D) counterparts. However, fundamental questions remain over the interaction between the bulky alkylammoniums and the 2DRP perovskite framework. Here, we unambiguously demonstrate that a sulfur sulfur interaction is present for a new bulky alkylammonium, 2 (methylthio)ethylamine hydrochloride (MTEACl) In addition to a weaker van der Waals interaction, the interaction between sulfur atoms in two MTEA molecules enables a (MTEA) 2 (MA) 4 Pb 5 I 16 n 5) perovskite framework with enhanced charge transport and stabilization. The result is 2DRP perovskite solar cells with significantly improved efficiency and stability. Cells with a power conversion efficiency as high as 18.06% (17.8% certified) are achieved, along with moisture tolerance for up to 1,512 h (under 70% humidity conditions) thermal stability for 375 h (at 85 degC) and stability under continuous light stress (85% of the initial efficiency retained over 1,000 h of operation at the maximum power point) Two dimensional perovskite solar cells have been engineered to be robust against moisture, high temperatures and light stress.
author_names: Hui-Hui Ren

Shidong Yu

Lingfeng Chao

Yingdong Xia

Yuanhui Sun

Shouwei Zuo

Fan Li

Tingting Niu

Yingguo Yang

Huan-xin Ju

Bixin Li

Hai Yan Du

Xingyu Gao

Jie-yu Zhang

Jianpu Wang

Lijun Zhang

Yonghua Chen

Wentao Huang
title: Efficient and stable Ruddlesden Popper perovskite solar cell with tailored interlayer molecular interaction
year: 2020

abstract: Abstract All polymer solar cells (All PSCs) offer several distinct merits including superior thermal stability and flexibility. Here, we report a novel polymer acceptor PJ1 that exhibits a narrow band gap around 1.4 eV and a high extinction coefficient about 1.39 x 105 cm 1. When PJ1 is blended with donor polymer PBDB T, all PSC with a record power conversion efficiency (PCE) of 14.4% is achieved, which is mainly attributed to the broad absorption, efficient charge separation and collection, and low energy loss. The synergetic effects of molecular weight of PJ1 on the photovoltaic performance are also investigated. It is found that the increase in molecular weight can result in the red shift of absorption along with slight enhancement of extinction coefficient, which therefore benefits photocurrent. In addition, all PSC based on PJ1 demonstrate much better thermal stability than the control device based on small molecule acceptor (TTPBT IC) as evidenced by the insignificant morphology change of PBDB T:PJ1 versus excessive phase separation of PBDB T:TTPBT IC when annealed at 150 degC. Of particular interest is that the all PSCs based on PBDB T:PJ1 can retain high PCEs even when the thickness of photoactive layer is increased over 300 nm (PCE of 12.1% or the device area is enlarged to 1 cm2 (PCE of 13.0%
author_names: Tao Jia

Jiabin Zhang

Wenkai Zhong

Yuanying Liang

Kai Zhang

Sheng Dong

Lei Ying

Feng Liu

Xiaohui Wang

Fei Huang

Yong Cao
title: 14.4% efficiency all polymer solar cell with broad absorption and low energy loss enabled by a novel polymer acceptor
year: 2020

abstract: Organic solar cells are currently experiencing a second golden age thanks to the development of novel non fullerene acceptors (NFAs) Surprisingly, some of these blends exhibit high efficiencies despite a low energy offset at the heterojunction. Herein, free charge generation in the high performance blend of the donor polymer PM6 with the NFA Y6 is thoroughly investigated as a function of internal field, temperature and excitation energy. Results show that photocurrent generation is essentially barrierless with near unity efficiency, regardless of excitation energy. Efficient charge separation is maintained over a wide temperature range, down to 100 K, despite the small driving force for charge generation. Studies on a blend with a low concentration of the NFA, measurements of the energetic disorder, and theoretical modeling suggest that CT state dissociation is assisted by the electrostatic interfacial field which for Y6 is large enough to compensate the Coulomb dissociation barrier.
author_names: Lorena Perdigon-Toro

Huotian Zhang

Anastasia A Markina

Jun Yuan

Seyed Mehrdad Hosseini

Christian M Wolff

Guangzheng Zuo

Martin Stolterfoht

Yingping Zou

Feng Gao

Denis Andrienko

Safa Shoaee

Dieter Neher
title: Barrierless Free Charge Generation in the High Performance PM6:Y6 Bulk Heterojunction Non Fullerene Solar Cell.
venue: Advanced materials
year: 2020

abstract: Summary Perovskite/silicon tandem solar cells represent an attractive pathway to upgrade the market leading crystalline silicon technology beyond its theoretical limit. Two terminal architectures result in reduced plant costs compared to four terminal ones. However, it is challenging to monolithically process perovskite solar cells directly onto the micrometer sized texturing on the front surface of record high efficiency amorphous/crystalline silicon heterojunction cells, which limits both high temperature and solution processing of the top cells. To tackle these hurdles, we present a mechanically stacked two terminal perovskite/silicon tandem solar cell, with the sub cells independently fabricated, optimized, and subsequently coupled by contacting the back electrode of the mesoscopic perovskite top cell with the texturized and metalized front contact of the silicon bottom cell. By minimizing optical losses, as achieved by engineering the hole selective layer/rear contact structure, and using a graphene doped mesoporous electron selective layer for the perovskite top cell, the champion tandem device demonstrates a 26.3% efficiency (25.9% stabilized) over an active area of 1.43 cm2.
author_names: Enrico Lamanna

Fabio Matteocci

Emanuele Calabro

Luca Serenelli

Enrico Salza

Luca Martini

Francesca Menchini

Massimo Izzi

Antonio Agresti

Sara Pescetelli

Sebastiano Bellani

Antonio Esau Del Rio Castillo

Francesco Bonaccorso

Mario Tucci

Aldo Di Carlo
title: Mechanically Stacked, Two Terminal Graphene Based Perovskite/Silicon Tandem Solar Cell with Efficiency over 26%
venue: Joule
year: 2020