title: All-solution-processed PbS quantum dot solar modules.
abstract: A rapid increase in power conversion efficiencies in colloidal quantum dot (QD) solar cells has been achieved recently with lead sulphide (PbS) QDs by adapting a heterojunction architecture, which consists of small-area devices associated with a vacuum-deposited buffer layer with metal electrodes. The preparation of QD solar modules by low-cost solution processes is required to further increase the power-to-cost ratio. Herein we demonstrate all-solution-processed flexible PbS QD solar modules with a layer-by-layer architecture comprising polyethylene terephthalate (PET) substrate/indium tin oxide (ITO)/titanium oxide (TiO2)/PbS QD/poly(3-hexylthiophene) (P3HT)/poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT : PSS)/Ag, with an active area of up to 30 cm(2), exhibiting a power conversion efficiency (PCE) of 1.3% under AM 1.5 conditions (PCE of 2.2% for a 1 cm(2) unit cell). Our approach affords trade-offs between power and the active area of the photovoltaic devices, which results in a low-cost power source, and which is scalable to larger areas.
authors.affiliation: Nanomechanical Systems Research Division, KIMM (Korea Institute of Machinery and Materials), Daejeon 305-343, Republic of Korea. sjeong@kimm.re.kr.
authors.forename: Jihoon
authors.initials: J
authors.lastname: Jang
authors.forename: Hyung Cheoul
authors.initials: HC
authors.lastname: Shim
authors.forename: Yeonkyeong
authors.initials: Y
authors.lastname: Ju
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Song
authors.forename: Hyejin
authors.initials: H
authors.lastname: An
authors.forename: Jong-Su
authors.initials: JS
authors.lastname: Yu
authors.forename: Sun-Woo
authors.initials: SW
authors.lastname: Kwak
authors.forename: Taik-Min
authors.initials: TM
authors.lastname: Lee
authors.forename: Inyoung
authors.initials: I
authors.lastname: Kim
authors.forename: Sohee
authors.initials: S
authors.lastname: Jeong