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Here we report the results of one such pairing: the in-situ formation of highly-doped, interface-matched, sharp nanocrystalline homojunctions (NHJs) with single step electrodeposition of two copper-indium-selenide (CISe) compounds on flexible foil. It produces a homogenous film, comprising inherently ordered, 3-dimensional interconnected network of <jats:italic>pn<\/jats:italic>-CISe NHJs. These CISe NHJs exhibit surprising non-linear emissions, quantized transitions, large carrier mobility, low trap-state-density, long carrier lifetime and possible up-conversion. They facilitate efficient separation of minority carriers, reduce recombination and essentially function like quantum materials. This approach mitigates the material issues and complex fabrication of incumbent nanoscale heterojunctions; it also overcomes the flexibility and scale-up challenges of conventional planar <jats:italic>pn<\/jats:italic> junctions. The self-stabilized CISe NHJ film can be roll-to-roll processed in ambient atmosphere, thus providing a promising platform for a range of optoelectronic technologies. This concept exemplified by CISe compounds can be adapted to create nano-scale <jats:italic>pn<\/jats:italic> junctions with other inorganic semiconductors.<\/jats:p>","DOI":"10.1038\/s41598-021-83526-0","type":"journal-article","created":{"date-parts":[[2021,2,19]],"date-time":"2021-02-19T16:46:37Z","timestamp":1613753197000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Quantized electronic transitions in electrodeposited copper indium selenide nanocrystalline homojunctions"],"prefix":"10.1038","volume":"11","author":[{"given":"Shalini","family":"Menezes","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anura P.","family":"Samantilleke","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bryon W.","family":"Larson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,2,17]]},"reference":[{"key":"83526_CR1","unstructured":"NREL certified efficiency chart https:\/\/www.nrel.gov\/pv\/assets\/pdfs\/cell-pv-eff-emergingpv.202001042.pdf"},{"key":"83526_CR2","doi-asserted-by":"publisher","unstructured":"Nguyen, B. 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