01080nas a2200169 4500008004100000245011300041210006900154260000800223300001600231490000700247520043400254100002200688700002100710700001900731700002800750856013200778 2011 eng d00aSolution-processed heterojunction solar cells based on p-type PbS quantum dots and n-type Bi2S3 nanocrystals0 aSolutionprocessed heterojunction solar cells based on ptype PbS  cAUG a3712–37170 v233 a

Bi2S3 nanocrystals are employed as an n-type, non-toxic, inorganic, solution-processed semiconductor in thin film solar cells. The first solution processed-inorganic p-n junction based on p-type PbS QDs and n-type Bi2S3 nanocrystals with both phases contributing to photocarrier generation is demonstrated. The reported devices show a power conversion efficiency of 1.6% for 860 nm PbS QDs and over 1% for 1300 nm PbS QDs.

1 aRath, Arup, Kumar1 aBernechea, Maria1 aMartinez, Luis1 aKonstantatos, Gerasimos uhttps://library.ncl.res.in/content/solution-processed-heterojunction-solar-cells-based-p-type-pbs-quantum-dots-and-n-type-bi2s301647nas a2200193 4500008004100000245009600041210006900137260000800206300001400214490000600228520095200234100002201186700002101208700001901229700003001248700001901278700002801297856012801325 2012 eng d00aSolution-processed inorganic bulk nano-heterojunctions and their application to solar cells0 aSolutionprocessed inorganic bulk nanoheterojunctions and their a cJUL a529–5340 v63 a

In the last decade, solution-processed quantum dot/nanocrystal solar cells have emerged as a very promising technology for third-generation thin-film photovoltaics because of their low cost and high energy-harnessing potential. Quantum dot solar cell architectures developed to date have relied on the use of bulk-like thin films of colloidal quantum dots. Here, we introduce the bulk nano-heterojunction concept for inorganic solution-processed semiconductors. This platform can be readily implemented by mixing different semiconductor nanocrystals in solution and allows for the development of optoelectronic nanocomposite materials with tailored optoelectronic properties. We present bulk nano-heterojunction solar cells based on n-type Bi2S3 nanocrystals and p-type PbS quantum dots, which demonstrate a more than a threefold improvement in device performance compared to their bilayer analogue, as a result of suppressed recombination.

1 aRath, Arup, Kumar1 aBernechea, Maria1 aMartinez, Luis1 ade Arquer, Pelayo, Garcia1 aOsmond, Johann1 aKonstantatos, Gerasimos uhttps://library.ncl.res.in/content/solution-processed-inorganic-bulk-nano-heterojunctions-and-their-application-solar-cells01682nas a2200217 4500008004100000245007600041210006900117260000800186300002500194490000600219520094700225100002801172700002201200700003001222700002701252700001701279700001901296700001401315700002801329856010701357 2013 eng d00aHeterovalent cation substitutional doping for quantum dot homojunctions0 aHeterovalent cation substitutional doping for quantum dot homoju cDEC aArticle number: 29810 v43 a

Colloidal quantum dots have emerged as a material platform for low-cost high-performance optoelectronics. At the heart of optoelectronic devices lies the formation of a junction, which requires the intimate contact of n-type and p-type semiconductors. Doping in bulk semiconductors has been largely deployed for many decades, yet electronically active doping in quantum dots has remained a challenge and the demonstration of robust functional optoelectronic devices had thus far been elusive. Here we report an optoelectronic device, a quantum dot homojunction solar cell, based on heterovalent cation substitution. We used PbS quantum dots as a reference material, which is a p-type semiconductor, and we employed Bi-doping to transform it into an n-type semiconductor. We then combined the two layers into a homojunction device operating as a solar cell robustly under ambient air conditions with power conversion efficiency of 2.7%.

1 aStavrinadis, Alexandros1 aRath, Arup, Kumar1 ade Arquer, Pelayo, Garcia1 aDiedenhofen, Silke, L.1 aMagen, Cesar1 aMartinez, Luis1 aSo, David1 aKonstantatos, Gerasimos uhttps://library.ncl.res.in/content/heterovalent-cation-substitutional-doping-quantum-dot-homojunctions